The Flash season 4

The Flash
Season 4
Promotional poster
Showrunner	Freddie Goodwin
Starring	Dacre Montgomery Kiersey Clemons Delroy Lindo Rahul Kohli Lakeith Stanfield Jessica Henwick William Fichtner Tati Gabrielle David Thewlis
No. of episodes	8
Release
Original network	Vesper+
Original release	October 5 (2029-10-05) – November 23, 2029 (2029-11-23)
Season chronology

The fourth season of the American superhero drama television series The Flash is based on the DC Comics character Barry Allen, a crime-scene investigator who becomes the superhero known as the Flash. The season was developed for television by Freddie Goodwin, who returned as showrunner alongside executive producers Hannah Greer, Marcus Vale, Lauren Certo, and David Mercer. It was produced by Vesper Studios, Goodwin Television, Red Runner Productions, and Dominion Street Entertainment for Vesper+.

The season stars Dacre Montgomery as Barry Allen / The Flash, with Kiersey Clemons, Delroy Lindo, Rahul Kohli, Lakeith Stanfield, Jessica Henwick, William Fichtner, Tati Gabrielle, and David Thewlis also starring. Maya Hawke, Giancarlo Esposito, John Boyega, and Courtney B. Vance appear in guest roles. Following the events of the third season, Central City lives with partial memories of erased timelines, while Barry Allen faces a new public era in which the city knows that the Flash's battles have altered reality.

The season adapts several villains from the Flash comics, including Leonard Snart / Captain Cold, Lisa Snart / Golden Glider, Sam Scudder / Mirror Master, Mark Mardon / Weather Wizard, Axel Walker / Trickster, Roscoe Dillon / the Top, and Clifford DeVoe / the Thinker. The season presents the Rogues as an organized criminal network formed in response to Central City's repeated disasters, public distrust of metahumans, and anger toward S.T.A.R. Labs technology. DeVoe serves as the main antagonist, manipulating the Rogues and the city's testimony archive to argue that Central City should be governed by prediction rather than protected by a hero acting at super-speed.

The fourth season premiered on Vesper+ on October 5, 2029, and consisted of eight weekly episodes released until November 23, 2029. It received mixed reviews from critics, who praised Montgomery, Clemons, Kohli, Fichtner, Gabrielle, and Thewlis, but criticized the season as overcrowded and less emotionally focused than the previous season. Reviewers generally considered the season ambitious but uneven, with particular criticism directed toward the underdevelopment of several villains within the eight-episode structure.

Episodes

See also: List of The Flash episodes

No. overall	No. in season	Title	Directed by	Written by	Original air date
25	1	"Rogues"	David Nutter	Freddie Goodwin	October 5, 2029 (2029-10-05)
A year after Central City begins remembering fragments of erased timelines, Barry works under public oversight while Iris manages the testimony archive. A museum gala honoring the Flash is attacked by Leonard Snart, who uses cold-gun technology stolen from a sealed S.T.A.R. Labs evidence vault. Snart refuses to kill civilians and instead exposes the city's hypocrisy: it celebrates the Flash while imprisoning metahumans, sealing dangerous technology, and hiding timeline damage behind legal committees. Cisco, now more confident in his vibration powers, tracks Snart through dimensional residue left by a mirror-based escape route. Barry captures several thieves but lets Snart escape after saving hostages from a collapsing ice structure. Meanwhile, Clifford DeVoe, a former legal theorist turned metahuman strategist, studies Iris's archive and concludes that Central City's problem is not crime, but the speed at which heroes make irreversible decisions.
26	2	"Through the Looking Glass"	David Nutter	Lauren Certo	October 12, 2029 (2029-10-12)
Sam Scudder, a criminal trapped in a mirror dimension during the accelerator disaster, returns with the ability to move through reflective surfaces and imprison people inside fractured reflections. Scudder frees Lisa Snart from police custody and offers Leonard a chance to build a crew that can survive a city ruled by speed, surveillance, and public memory. Iris investigates complaints that the testimony archive is being used by prosecutors to punish people for events from erased timelines. Barry enters the mirror dimension to rescue Linda Park and several witnesses, but Scudder forces him to confront reflections of people who remember being failed by the Flash in lives Barry never lived. Cisco and Hartley stabilize a vibration bridge, allowing Barry to escape. DeVoe secretly offers Scudder legal protection in exchange for access to mirror-space, calling it the first courtroom where time itself can be cross-examined.
27	3	"Weather Patterns"	Jennifer Phang	Thomas Pound	October 19, 2029 (2029-10-19)
Mark Mardon attacks federal reconstruction sites using weaponized storm systems, claiming the city is being rebuilt for the rich while disaster survivors remain displaced. Joe investigates Mardon's past and discovers that his brother died during the first accelerator explosion after emergency crews diverted resources to protect S.T.A.R. Labs executives. Barry tries to reason with Mardon but is accused of saving institutions before neighborhoods. Iris publishes a report showing that several areas hardest hit by Flash-related disasters received the least aid. Leonard Snart recruits Mardon into the Rogues but warns him that killing civilians will make them no better than the systems they hate. DeVoe manipulates the relief hearings by presenting Barry's unsanctioned interventions as evidence that Central City has surrendered civic authority to a man who can rewrite outcomes before anyone else can object.
28	4	"Trick Questions"	Jennifer Phang	Sarah Tarkoff	October 26, 2029 (2029-10-26)
Axel Walker, a livestreaming anarchist calling himself the Trickster, hijacks the testimony archive and turns erased-timeline memories into public entertainment. His broadcasts force victims to relive impossible deaths while viewers vote on which memories should be released next. Barry wants to shut down the archive entirely, but Iris argues that destroying the record would punish victims for someone else's exploitation. Cisco and Hartley trace Trickster's signal through old S.T.A.R. Labs communication towers, while Eddie confronts his fear that his own unstable timeline makes him another public curiosity. Caitlin appears briefly to Barry through an archived medical message, reminding him that systems built to heal can still be abused without becoming worthless. Barry captures Trickster without destroying the archive, but DeVoe uses the attack to propose a legal injunction against all unsupervised Flash activity.
29	5	"The Top Spins"	Deborah Chow	Eric Wallace	November 2, 2029 (2029-11-02)
Roscoe Dillon, a physicist whose vestibular system was altered by the Speed Force fracture, begins inducing mass vertigo across Central City financial districts. Dillon believes the city must be physically disoriented before it can understand how ordinary people feel living under impossible events decided by speedsters, scientists, and politicians. DeVoe helps him target the courthouse where Barry's public oversight hearing is scheduled. At the hearing, prosecutors argue that the Flash's refusal to kill Zoom and Malcolm Thawne endangered the city, while Iris counters that accountability cannot become state ownership of a person's body. Leonard Snart interrupts Dillon's attack, revealing that even the Rogues believe DeVoe is pushing them toward chaos for his own agenda. Barry saves the courthouse by trusting Cisco to anchor the crowd through vibration instead of trying to move everyone himself. DeVoe privately declares that Team Flash is the true obstacle.
30	6	"Cold War"	Deborah Chow	Lauren Certo and Thomas Pound	November 9, 2029 (2029-11-09)
DeVoe engineers a conflict between the Rogues and Team Flash by leaking evidence that Lisa Snart's powers are slowly killing her. Leonard steals a cryogenic stabilizer from S.T.A.R. Labs, forcing Barry to pursue him through a citywide blackout caused by Mardon. Lisa admits that she joined the Rogues because the law only saw her as stolen technology wearing a human body. Joe and Linda expose DeVoe's role in arranging the blackout, but DeVoe uses mirror-space to appear in several courtrooms at once and announces that he is filing a civic injunction to suspend the Flash from operating inside Central City. Barry and Leonard briefly cooperate to save Lisa, creating an uneasy respect between them. However, DeVoe captures Hartley and uses his harmonic research to build a device capable of predicting Cisco's dimensional anchors before he creates them.
31	7	"The Trial of the Flash"	Uta Briesewitz	Sarah Tarkoff and Eric Wallace	November 16, 2029 (2029-11-16)
DeVoe brings Barry before a special civic tribunal, arguing that the Flash's speed makes meaningful consent impossible because he can act before law, evidence, or public debate can respond. Barry refuses to reveal every secret identity and timeline event connected to Team Flash, knowing the testimony would expose innocent people. Iris defends Barry by admitting the archive's failures while arguing that the answer to dangerous power is transparent community, not DeVoe's intellectual dictatorship. DeVoe triggers his prediction device, trapping Cisco in a loop of failed anchors and allowing the Rogues to attack key sites across the city. Snart realizes DeVoe intends to sacrifice the Rogues as proof that Central City needs his rule. Caitlin appears one last time in a Speed Force echo, helping Barry understand that accountability means accepting limits, not surrendering judgment. Barry submits to oversight but refuses to stop saving lives.
32	8	"The Thinker's City"	David Nutter	Freddie Goodwin and Lauren Certo	November 23, 2029 (2029-11-23)
DeVoe uses mirror-space, harmonic prediction, and testimony archive data to transform Central City into a controlled simulation where every emergency is anticipated and every citizen's choices are assigned risk values. The city initially appears safer, but Iris discovers that DeVoe's system prevents people from taking actions that might lead to unpredictable futures, effectively freezing civic life. Barry cannot outrun the simulation because DeVoe predicts every rescue path before he moves. Cisco breaks the prediction engine by anchoring dozens of uncertain outcomes at once, while Snart and the Rogues sabotage mirror relays to reclaim their own agency. Barry confronts DeVoe and admits that the Flash should be accountable, but no mind has the right to replace a city with a calculation. DeVoe is defeated when Iris broadcasts the archive live, flooding his system with contradictory human testimony. The season ends with Barry accepting a public charter for Team Flash as a new threat watches from the future.

Cast and characters

Main article: List of The Flash characters

Main

• Dacre Montgomery as Barry Allen / The Flash
• Kiersey Clemons as Iris West
• Delroy Lindo as Detective Joe West
• Rahul Kohli as Cisco Ramon / Vibe
• Lakeith Stanfield as Eddie Thawne
• Jessica Henwick as Linda Park
• William Fichtner as Leonard Snart / Captain Cold
• Tati Gabrielle as Lisa Snart / Golden Glider
• David Thewlis as Clifford DeVoe / the Thinker

Recurring

• Riz Ahmed as Hartley Rathaway
• Ming-Na Wen as Dr. Christina Vale
• Jodie Comer as Dr. Eliza Harmon
• Ken Leung as Captain Elias Singh
• Sam Claflin as Sam Scudder / Mirror Master
• Jack Quaid as Axel Walker / Trickster
• Taron Egerton as Roscoe Dillon / the Top
• Dan Stevens as Mark Mardon / Weather Wizard

Guest

• Maya Hawke as Caitlin Snow
• Giancarlo Esposito as Eobard Thawne / Reverse-Flash
• John Boyega as Ronnie Raymond
• Courtney B. Vance as Henry Allen
• Thandiwe Newton as Nora Allen
• Paddy Considine as Malcolm Thawne / Cobalt Blue
• Ben Mendelsohn as Hunter Zolomon / Zoom
• Keith David as the voice of Gideon

Production

Development

Vesper+ renewed The Flash for a fourth season in December 2028 after the release of the third season finale, "Run Still". Freddie Goodwin returned as showrunner, with Hannah Greer, Marcus Vale, Lauren Certo, and David Mercer continuing as executive producers. The renewal confirmed another eight-episode season and described the fourth season as a more public-facing chapter about accountability, civic memory, and the rise of Central City's organized metahuman criminal class.

Goodwin said the fourth season was designed to move the series out of Barry Allen's internal Speed Force reckoning and into a citywide debate about what the Flash should be allowed to do. After the third season ended with Central City remembering fragments of erased timelines, the writers wanted to explore how a population would respond to proof that one hero's battles had altered reality itself. Rather than treat the public as ungrateful, the season was written to make some criticism of Barry legitimate while still rejecting the idea that fear should hand power to authoritarian figures.

The writers chose to adapt the Rogues because the show had reached a point where Barry's enemies needed to feel shaped by Central City's history. Goodwin said the Rogues were not introduced as random villains but as people responding to the same disasters, technologies, and institutional failures that created the Flash. Leonard Snart became the ideological center of the group because his criminal code allowed the writers to contrast him with both Barry and Clifford DeVoe. Snart breaks the law, but he rejects the total control DeVoe represents.

Clifford DeVoe / the Thinker was selected as the season's primary antagonist because the writers wanted an enemy Barry could not defeat by becoming faster or more emotionally honest. DeVoe's argument is intellectual and civic: the Flash acts before anyone can consent, and therefore Central City should be governed by prediction rather than improvisation. Goodwin described DeVoe as "a villain with a point and a monstrous solution." His presence allowed the season to adapt more comic villains while keeping one thematic spine.

The season also shifted Maya Hawke's role from main cast to guest. Goodwin said Caitlin Snow's death remained permanent and that using Hawke too heavily would weaken the impact of the second season's major loss. Caitlin appears only through archived recordings and a Speed Force echo because the writers wanted her influence to remain important without turning her into a regular ghost character. Hawke was credited as a guest star for the season.

Writing

Writing for the fourth season began in January 2029. The writers' room included Freddie Goodwin, Lauren Certo, Thomas Pound, Sarah Tarkoff, Eric Wallace, and consulting producer Hannah Greer. The season was structured around the question of whether accountability can exist when one person can act faster than every institution around him. The writers wanted to avoid simplistic answers. Barry saves lives because he can move before disaster completes itself, but the season asks who gets to review the consequences afterward.

The Rogues were written as a social response to Central City's instability. Leonard Snart and Lisa Snart represent people shaped by stolen technology and criminal survival. Mirror Master represents the hidden spaces created by scientific disasters. Weather Wizard represents neighborhoods abandoned after large-scale metahuman incidents. Trickster represents exploitation of trauma as spectacle. The Top represents disorientation and public distrust. DeVoe sees all of them as symptoms to be studied, manipulated, and eventually sacrificed in his argument for controlled order.

Iris West's testimony archive became one of the season's central narrative devices. In the third season, the archive helped Central City process impossible memories. In the fourth, it becomes politically contested. Prosecutors, victims, criminals, journalists, and DeVoe all attempt to use the archive to define what the city remembers and what it should do with those memories. Goodwin said Iris's storyline was essential because it prevented the season's public accountability theme from becoming only a courtroom problem for Barry.

Cisco Ramon's development into Vibe was expanded across the season. The writers wanted Cisco's powers to become practical and heroic without losing the horror introduced in the third season. His ability to anchor uncertain outcomes becomes the direct counter to DeVoe's predictive control. Where DeVoe wants to reduce the city to probabilities, Cisco's powers confirm that possibility remains alive precisely because the future cannot be fully calculated.

Despite these intentions, the compressed eight-episode structure created limitations for the season's villain roster. Goodwin later acknowledged that the writers attempted to introduce more Rogues than the season could fully support. He said the creative team wanted Central City to feel crowded by consequences, but that the season sometimes moved too quickly from one antagonist to another. This became one of the major criticisms of the season after its release.

The seventh episode, "The Trial of the Flash", was written as the season's philosophical centerpiece. Goodwin said the episode is not a traditional trial about whether Barry is guilty of one crime. Instead, it is a trial over the idea of the Flash. DeVoe argues that speed destroys consent, Iris argues that records and community can create accountability, and Barry accepts that saving lives does not exempt him from limits. The episode was written to make Barry mature without humiliating him or making him abandon heroism.

The finale, "The Thinker's City", was built around the idea that perfect safety can become another kind of imprisonment. DeVoe's controlled simulation prevents crime and disaster by eliminating uncertainty, but it also eliminates meaningful choice. Goodwin said the ending was designed to reject both extremes: Barry cannot operate without accountability, but Central City cannot surrender its future to one mind that mistakes prediction for justice. The Rogues' decision to help destroy DeVoe's mirror relays was intended to show that even criminals can resist a world without agency.

Casting

Dacre Montgomery, Kiersey Clemons, Delroy Lindo, Rahul Kohli, Lakeith Stanfield, and Jessica Henwick returned from the previous season as Barry Allen / The Flash, Iris West, Joe West, Cisco Ramon / Vibe, Eddie Thawne, and Linda Park, respectively. William Fichtner and Tati Gabrielle were promoted to the main cast as Leonard Snart / Captain Cold and Lisa Snart / Golden Glider after recurring in earlier seasons. David Thewlis joined the main cast as Clifford DeVoe / the Thinker.

Goodwin said Thewlis was cast because DeVoe needed to be persuasive before he became frightening. The character was written as a scholar and legal theorist whose intellect allows him to diagnose real civic problems but whose arrogance makes him believe only he should be allowed to solve them. Thewlis described DeVoe as someone who views empathy as unreliable data and heroism as a primitive response to systemic failure.

Sam Claflin, Jack Quaid, Taron Egerton, and Dan Stevens joined the recurring cast as Sam Scudder / Mirror Master, Axel Walker / Trickster, Roscoe Dillon / the Top, and Mark Mardon / Weather Wizard, respectively. The writers used these characters to expand the Rogues, though their limited screen time became one of the season's most frequent criticisms. Goodwin said each villain was chosen because their powers could dramatize part of the season's civic argument: reflection, spectacle, disorientation, and environmental consequence.

Maya Hawke returned as Caitlin Snow in a guest capacity. The production confirmed before the season premiere that Hawke would not be part of the main cast, emphasizing that Caitlin remained dead. Her appearances were limited to "Trick Questions" and "The Trial of the Flash", where archived messages and Speed Force echoes help Barry understand accountability without undoing the character's sacrifice.

Giancarlo Esposito, John Boyega, Courtney B. Vance, Thandiwe Newton, Paddy Considine, and Ben Mendelsohn appeared in guest roles, reprising characters from previous seasons through brief appearances, flashbacks, testimony archive material, or Speed Force echoes. The production avoided listing them as main or recurring cast because their appearances were limited and not part of the season's central ensemble.

Filming

Principal photography for the fourth season began in March 2029 and concluded in July 2029. Filming took place primarily in Vancouver, British Columbia, with additional exterior work used to represent Central City's restored civic spaces, tribunal buildings, and reconstruction districts. Production designer Lila Chen returned and redesigned parts of the city to reflect partial recovery after years of disasters. The result was brighter than the second and third seasons but intentionally uneasy, with public memorials, surveillance systems, and Flash oversight posters visible throughout the city.

The season introduced several major new sets, including the civic tribunal chamber, the testimony archive office, DeVoe's study, and the Rogues' hideout. The Rogues' hideout was designed as a repurposed transit station beneath Central City, filled with stolen technology, improvised medical equipment, and evidence of people living between legality and survival. Chen said the set needed to feel criminal but not cartoonish, because the season treats the Rogues as products of the city rather than outsiders.

Mirror-space sequences required a combination of practical reflective sets and visual effects. Director David Nutter said the crew avoided simple mirror mazes and instead built spaces that looked like distorted civic interiors, including courtrooms, archives, and police corridors. This allowed Mirror Master's powers to tie directly into the season's themes of evidence, testimony, and distorted public memory.

The tribunal scenes in "The Trial of the Flash" were filmed over several days with limited action sequences. Goodwin said the episode was deliberately staged like a pressure chamber, forcing the characters to argue instead of run. The production used long takes and restrained camera movement to contrast with the speed-heavy episodes around it. Montgomery and Clemons described the episode as one of the most dialogue-intensive shoots of the series.

The finale combined practical city sets with extensive digital simulation effects. DeVoe's controlled version of Central City was created by cleaning up familiar locations until they felt unnaturally orderly, removing graffiti, traffic variation, and unpredictable human movement. As the simulation collapses, those details return in chaotic layers. The production team wanted the audience to feel that imperfection itself was being restored.

Visual effects

Mara Ellison returned as visual effects supervisor. The fourth season required a wider variety of powers than previous seasons due to the expanded Rogues gallery. The visual effects team created distinct looks for cold technology, mirror travel, weather manipulation, vertigo fields, and DeVoe's predictive simulation. Ellison said the challenge was making the season feel visually varied without losing the show's established speed language.

Captain Cold's cold-gun effects were designed as tactical and precise, forming angular ice structures rather than uncontrolled frost. Golden Glider's movement used gold energy trails and gravity-defying skating effects, distinguishing Lisa from the speedsters while still giving her action scenes fluid motion. Mirror Master's effects used fractured reflections and delayed images, often showing multiple versions of a character making different choices.

Weather Wizard's storm effects were tied to the red-weather imagery from the second season but made more localized and emotionally volatile. The Top's vertigo powers used rotating camera rigs, warped backgrounds, and subtle digital displacement. Trickster's broadcasts relied less on powers and more on distorted media overlays, hacked archive footage, and practical explosive devices.

DeVoe's simulation effects were intentionally clean and controlled. When his prediction system activates, the city appears overlaid with risk diagrams, probability paths, and mirrored decision trees. By the finale, the effect becomes oppressive, with citizens surrounded by invisible calculations that prevent spontaneous movement. Cisco's vibration anchors were designed as the visual opposite: unstable, colorful, and alive with branching possibility.

Music

Blake Neely and Hildur Guðnadóttir returned to compose the fourth season's score. Neely expanded the heroic Flash theme into a more public and ceremonial variation used during the oversight hearings and civic scenes, while Guðnadóttir developed colder and more mathematical textures for DeVoe. The season also introduced motifs for the Rogues, using recurring percussion and bass patterns that could be altered depending on which member was leading a scene.

Captain Cold's motif uses low strings and metallic pulses, while Golden Glider's theme adds brighter, sliding tones. Mirror Master is associated with reversed piano and glass-like percussion. Weather Wizard's music incorporates rumbling percussion and unstable brass. Trickster's scenes use distorted carnival rhythms and chopped media noise. The Top's motif relies on circling strings and gradually shifting tempo.

DeVoe's theme is deliberately restrained. Guðnadóttir described it as music that refuses to breathe. It uses controlled pulses, muted piano, and repeating patterns that become more complex as the season progresses. In the finale, the theme collapses when Iris floods his system with contradictory testimony, allowing the Flash theme and Cisco's vibration motif to re-enter the score.

Marketing

Vesper+ announced the fourth season in December 2028 after the third season finale. The announcement confirmed that the season would adapt the Rogues and introduce Clifford DeVoe / the Thinker. The first teaser showed Barry standing before a civic tribunal while voices from Iris's testimony archive accused, defended, thanked, and condemned the Flash. The tagline was "A city saved is not a city settled."

The official trailer was released in August 2029. It introduced Captain Cold, Golden Glider, Mirror Master, Weather Wizard, Trickster, the Top, and DeVoe. The trailer emphasized the season's shift toward public accountability and organized villainy, ending with DeVoe saying, "The Flash is not justice. He is velocity without consent." The trailer was widely discussed for positioning several comic villains within one connected seasonal arc.

Character posters were released for Barry, Iris, Cisco, Joe, Eddie, Linda, Leonard Snart, Lisa Snart, DeVoe, Mirror Master, Weather Wizard, Trickster, and the Top. A separate set of Rogues posters used police-file styling but paired each villain with a civic theme: "Property", "Memory", "Weather", "Spectacle", "Balance", and "Control". Maya Hawke was not included in the main poster campaign, reflecting Caitlin Snow's guest status.

In September 2029, Vesper+ released an in-universe legal brief titled Central City v. The Flash, summarizing fictional arguments for and against metahuman oversight. The campaign also included weekly archive entries from Iris West and short Rogue files narrated by Linda Park. Goodwin said the campaign was meant to make viewers ask whether the Flash should be trusted before the season itself answered the question.

Release

The fourth season premiered on Vesper+ on October 5, 2029. The season consisted of eight weekly episodes, with the finale released on November 23, 2029.

Release schedule

No. overall	No. in season	Title	Original release date
25	1	"Rogues"	October 5, 2029
26	2	"Through the Looking Glass"	October 12, 2029
27	3	"Weather Patterns"	October 19, 2029
28	4	"Trick Questions"	October 26, 2029
29	5	"The Top Spins"	November 2, 2029
30	6	"Cold War"	November 9, 2029
31	7	"The Trial of the Flash"	November 16, 2029
32	8	"The Thinker's City"	November 23, 2029

Reception

Critical response

The fourth season received mixed reviews from critics. While some praise was directed toward the performances of Dacre Montgomery, Kiersey Clemons, Rahul Kohli, William Fichtner, Tati Gabrielle, and David Thewlis, many reviewers criticized the season as overcrowded and less emotionally focused than the previous season. Critics felt that the introduction of several comic-book villains gave the season a wider scope but weakened its storytelling, with multiple characters receiving limited development despite being promoted as major additions.

The season's use of the Rogues received a mixed response. Leonard Snart / Captain Cold and Lisa Snart / Golden Glider were generally considered the strongest additions, while the appearances of Mirror Master, Weather Wizard, Trickster, and the Top were criticized as underdeveloped. Several reviewers argued that the season attempted to adapt too many villains within an eight-episode structure, resulting in a story that felt compressed and uneven.

David Thewlis's performance as Clifford DeVoe / the Thinker was praised, though critics were divided on the character's role as the season's main antagonist. Some felt DeVoe's arguments about accountability gave the season a more mature political edge, while others considered the storyline too abstract and less compelling than the emotional Speed Force arc of the third season. The courtroom-heavy episode "The Trial of the Flash" received praise for ambition but criticism for slowing the season's momentum.

Critics also noted that several returning storylines were underused. The season was criticized for carrying over unresolved emotional material from earlier seasons without giving it enough attention, particularly the aftermath of Caitlin Snow's death, Ronnie Raymond's disappearance, and Eobard Thawne's continued presence. Maya Hawke's guest appearance as Caitlin Snow was received positively, but some reviewers felt the season relied on her memory without adding much new emotional depth.

On review aggregation website Rotten Tomatoes, the season holds an approval rating of 61% based on 48 critic reviews, with an average rating of 6.1/10. The website's critical consensus reads: "Though The Flash season four benefits from a stronger rogues gallery and committed performances, its crowded plotting and uneven focus make for the series' weakest outing so far." On Metacritic, the season has a weighted average score of 58 out of 100 based on 21 critics, indicating "mixed or average reviews".

Audience response

Audience response to the season was similarly divided. Viewers generally praised Captain Cold and Golden Glider, with many considering them the most successful new additions to the series. Cisco's development into Vibe was also received positively, particularly in episodes where his powers were central to solving problems Barry could not simply outrun. Iris's testimony archive storyline continued to receive support from viewers who enjoyed the show's political and journalistic elements.

However, many viewers criticized the season's pacing and villain structure. Mirror Master, Weather Wizard, Trickster, and the Top were frequently described as interesting on paper but rushed in execution. Some viewers felt the season attempted to do too much at once by combining the Rogues, DeVoe, public oversight, Caitlin's memory, Cisco's powers, and Barry's accountability arc in only eight episodes. The season was often compared unfavorably to the third season, which had been praised for its tighter emotional focus.

Audience viewership

Vesper+ reported that the fourth season premiere performed strongly, particularly among viewers who had followed the testimony archive campaign after the third season. The introduction of the Rogues was cited as a major driver of initial audience interest. Viewership reportedly declined slightly across the middle episodes before rising again for "The Trial of the Flash" and "The Thinker's City".

The service also reported strong engagement with the in-universe legal brief and Rogue files. Vesper+ did not release exact streaming figures.

Accolades

Year	Award	Category	Nominee(s)	Result
2030	Saturn Awards	Best Superhero Television Series	The Flash	Nominated
	Saturn Awards	Best Supporting Actor in a Television Series	Rahul Kohli	Nominated
	Saturn Awards	Best Guest Performance in a Television Series	Maya Hawke	Nominated
	Primetime Creative Arts Emmy Awards	Outstanding Special Visual Effects in a Season or a Movie	The Flash	Nominated
	Hollywood Music in Media Awards	Best Original Score in a TV Show/Limited Series	Blake Neely and Hildur Guðnadóttir	Nominated

Future

Vesper+ renewed The Flash for a fifth season in December 2029. Goodwin said the fifth season would deal with the consequences of Team Flash's public charter and the future threat teased at the end of "The Thinker's City". He stated that the fourth season had moved Barry from private hero to publicly accountable protector, while the fifth would test whether that structure could survive threats from outside Central City's present.

Goodwin also acknowledged the mixed response to the fourth season, saying that the next season would use a more focused antagonist structure and give the core ensemble more room after the crowded Rogues storyline. He described the Rogues as characters who would remain part of the show's world but would not dominate every future story. The renewal announcement confirmed that Dacre Montgomery, Kiersey Clemons, Delroy Lindo, Rahul Kohli, Lakeith Stanfield, Jessica Henwick, William Fichtner, and Tati Gabrielle were expected to return.

External links

• Official website
• The Flash at IMDbTemplate:EditAtWikidataTemplate:WikidataCheck