Season 4 (The Flash: 2014)

Season 4
Information
Network	The CW
Start Date	October 10, 2017
End Date	May 22, 2018
Time Slot	Tuesdays at 8:00 pm
Number of Episodes	23
Chronology
Preceded by	Season 3
Followed by	Season 5

“	My name is Barry Allen, and I am the fastest man alive. To the outside world, I am an ordinary forensic scientist. But secretly, with the help of my friends at S.T.A.R. Labs, I fight crime and find other metahumans like me. But I became lost in time. It took everything in my friends' power to bring me back. And in doing so, our world was opened up to new threats, and I'm the only one fast enough to stop them. I am The Flash.	”
— Introduction[src]

The fourth season of The Flash premiered on October 10, 2017, and concluded on May 22, 2018. The season consists of 23 episodes.

Synopsis

Running up against an evil time remnant version of yourself is something no one should ever have to do, but that's exactly what faced Barry Allen (aka The Flash) as he fought to save the life of fiancée Iris West from the God of Speed known as Savitar.

Barry's victory was short-lived, however, as an unbalanced Speed Force began to wreak havoc on Central City, forcing Barry to sacrifice himself for the greater good.

With The Fastest Man Alive now trapped inside an extra-dimensional energy, and unknown dangers lurking in the shadows, it will be up to Team Flash to free Barry from his own personal Hell.

Cast

Main Cast

• Grant Gustin as The Flash (Barry Allen)
• Candice Patton as Iris West-Allen
• Danielle Panabaker as Killer Frost (Caitlin Snow)
• Carlos Valdes as Vibe (Cisco Ramon)
• Keiynan Lonsdale as Kid Flash (Wally West) *
• Neil Sandilands as Thinker (Clifford DeVoe)
• Tom Cavanagh as Harry Wells / Harrison Wolfgang Wells / H. Lothario Wells / Wells 2.0 / Wells the Grey / Reverse-Flash/Harrison Wells (Eobard Thawne) / Sonny Wells / HP Wells
• Jesse L. Martin as Joe West

Recurring Cast

• Katee Sackhoff as Amunet Black (Leslie Jocoy)
• Danny Trejo as Breacher (Josh)
• Kim Engelbrecht as Marlize DeVoe

In-Universe Guest Stars

• Emily Bett Rickards as Felicity Smoak / Felicity
• Stephen Amell as Green Arrow (Oliver Queen) / Dark Arrow (Oliver)
• Victor Garber as Firestorm (Martin Stein)
• Caity Lotz as White Canary (Sara Lance)
• Chyler Leigh as Alex Danvers
• Franz Drameh as Firestorm (Jefferson Jackson)
• Paul Blackthorne as Sturmbannführer (Quentin Lance)
• Jeremy Jordan as General Schott
• Juliana Harkavy as Black Canary (Dinah Drake)
• Melissa Benoist as Supergirl (Kara Danvers) / Overgirl (Kara)
• David Ramsey as John Diggle / Thinker/John Diggle (Clifford DeVoe)
• Wentworth Miller as Citizen Cold (Leo Snart)
• Russell Tovey as The Ray (Ray Terrill)
• Frederick Schmidt as Metallo-X
• Katie Cassidy as Siren-X (Laurel Lance)

Notes:

1. Keiynan Lonsdale is credited as a series regular through 4x03 Luck Be a Lady and a special guest star in We Are The Flash.

Episodes

#	Episode Title	Directed by	Story By	Teleplay By	Episode Airdate
1	The Flash Reborn	Glen Winter	Andrew Kreisberg	Todd Helbing & Eric Wallace	October 10, 2017
With Barry in the Speed Force, Iris, Kid Flash, Joe and Vibe have taken over protecting Central City. However, when a powerful armored villain threatens to level the city if The Flash doesn't appear, Cisco makes a risky decision to break Barry out of the Speed Force. However, the Barry that comes out isn't the same Barry that went in.
2	Mixed Signals	Alexandra La Roche	Jonathan Butler & Gabriel Garza		October 17, 2017
Barry has his hands full when he takes on a dangerous meta who can control technology, while also confronting an obstacle in his personal life; the ramifications of abandoning Iris for six months to balance the Speed Force. Meanwhile, Gypsy breaches in for a hot date with Cisco, but she gets annoyed when his work keeps them apart.
3	Luck Be a Lady	Armen V. Kevorkian	Sam Chalsen & Judalina Neira		October 24, 2017
Barry and the team are hit by a string of bad luck and realize it is the handiwork of a new meta, Becky nicknamed Hazard, who has the ability to give others bad luck, while cashing in the benefits for herself. Meanwhile, Harry Wells returns to Earth-1 to give Wally a message from Jesse.
4	Elongated Journey Into Night	Tom Cavanagh	Sterling Gates & Thomas Pound		October 31, 2017
Cisco is shocked when Gypsy's father, Breacher, shows up on Earth-1. Breacher takes an immediate disliking to Cisco and decides to hunt him. Meanwhile, Barry runs into his old nemesis, Ralph Dibny.
5	Girls Night Out	Laura Belsey	Lauren Certo & Kristen Kim		November 7, 2017
Having received an ominous threat from her old boss, Amunet, Caitlin fears that her past time as Killer Frost may be back to haunt her. Felicity comes to Central City to help the girls celebrate Iris' bachelorette party, while Cisco, Joe and the guys take Barry out for a night on the town.
6	When Harry Met Harry...	Brent Crowell	Jonathan Butler & Gabriel Garza		November 14, 2017
When collectors of Native American artifacts are attacked by a meta named Mina Chaytan who can bring inanimate objects to life, Barry turns to a surprising ally for help. Determined to crack the identity of The Thinker, Harry enlists Cisco's help to summon the ultimate think tank; "The Council of Wells", a roundtable of the brightest Harrison Wells' from various Earths.
7	Therefore I Am	David McWhirter	Eric Wallace & Thomas Pound		November 21, 2017
Barry comes face to face with DeVoe. DeVoe's past is revealed through flashbacks. Meanwhile, Iris puts the final touches on the wedding, which is a week away.
8	Crisis on Earth-X, Part 3	Dermott Downs	Andrew Kreisberg & Marc Guggenheim	Todd Helbing	November 28, 2017
Barry and Iris' wedding brings the gang together, but things go awry when villains from Earth-X attack the ceremony. All of the superheroes band together with help from their super friends like Citizen Cold, The Ray, Felicity Smoak, Iris West and Alex Danvers to take on their most formidable villains yet. Earth's mightiest heroes - Green Arrow, Supergirl, The Flash and White Canary - lead their teams into battle to save the world.
9	Don't Run	Stefan Pleszczynski	Sam Chalsen & Judalina Neira		December 5, 2017
Amunet kidnaps Caitlin and puts meta-dampener handcuffs on her to keep her from turning into Killer Frost. Amunet tells Caitlin she needs her to perform a tricky medical task and if Caitlin fails, Amunet will kill her. Meanwhile, The Thinker traps The Flash in a speedster-proof prison. With the clock ticking, the Team doesn't have the time or resources to track both Caitlin and Barry, so Iris is forced to choose who to save.
10	The Trial of The Flash	Philip Chipera	Lauren Certo & Kristen Kim		January 16, 2018
As Barry's trial for the murder of Clifford DeVoe begins, Iris and Joe must decide how far they are willing to go to keep Barry out of prison.
11	The Elongated Knight Rises	Alexandra La Roche	Sterling Gates & Thomas Pound		January 23, 2018
When a familiar villain returns to terrorize Central City, Ralph must rise up to defend the innocent while Barry is detained by his trial. Meanwhile, Barry searches for the strength to keep his optimism alive in the face of his new circumstances.
12	Honey, I Shrunk Team Flash	Chris Peppe	Sam Chalsen & Judalina Neira		January 30, 2018
A meta who can shrink anything he touches battles Team Flash. Cisco and Ralph get caught in his crossfire and are shrunk to miniature versions of themselves. Cecile realizes her pregnancy has caused her to have temporary powers and discovers she can hear other people's thoughts, which unnerves Joe. Meanwhile, Barry meets someone with a mysterious connection to Henry Allen.
13	True Colors	Tara Nicole Weyr	Jonathan Butler & Gabriel Garza		February 6, 2018
After hearing that Amunet has struck a deal to buy all of the metahumans in Iron Heights, Barry must decide if he should expose his powers in order to save his cellmates. After a visit from an old friend, Ralph is reminded of his shady past and wonders if he's really a changed man.
14	Subject 9	Ralph Hemecker	Mike Alber & Gabe Snyder		February 27, 2018
Barry meets a powerful woman whose abilities could help him in his battle with DeVoe. Meanwhile, after learning that DeVoe is targeting everyone who was on the bus, Ralph decides he doesn't want to be a hero anymore, his only concern is staying alive. Harry offers to help Joe.
15	Enter Flashtime	Gregory Smith	Todd Helbing & Sterling Gates		March 6, 2018
When a nuclear bomb detonates in downtown Central City, Barry, Jesse Quick and Jay Garrick slow down time by entering Flashtime. As everyone in the city is frozen, the three speedsters push themselves to the breaking point to save the city and everyone in it.
16	Run, Iris, Run	Harry Jierjian	Eric Wallace		March 13, 2018
Team Flash confronts a new bus meta, Matthew AKA Melting Point, with the ability to swap people's DNA. During a battle with Team Flash, Matthew transfers Barry's super speed to Iris. Now, with a new threat unleashed on Central City, Barry must act as the team leader while Iris takes on the mantle of superhero speedster in order to defeat their new foe.
17	Null and Annoyed	Kevin Smith	Lauren Certo & Kristen Kim		April 10, 2018
Barry and Ralph take different approaches to finding the remaining bus metas before DeVoe gets to them. However, Ralph's cavalier attitude frustrates Barry and the two clash over what it means to be a hero. Meanwhile, Breacher returns to ask Cisco for a favor.
18	Lose Yourself	Hanelle Culpepper	Jonathan Butler & Gabriel Garza		April 17, 2018
When Barry and Team Flash find a way to enter The Thinker's lair, Ralph considers crossing a dangerous line to defeat DeVoe. Meanwhile, Joe is concerned by Harry's recent behavior.
19	Fury Rogue	Rachel Talalay	Joshua V. Gilbert & Jeff Hersh		April 24, 2018
When Barry needs help transporting a dangerous meta, he calls on a new friend for help - Citizen Cold; Cisco becomes suspicious of Harry.
20	Therefore She Is	Rob J. Greenlea	Sterling Gates & Thomas Pound		May 1, 2018
Barry and Team Flash team up with Gypsy to try to thwart The Thinker's plan. Meanwhile, Cisco and Gypsy have a heart-to-heart talk about their relationship.
21	Harry and the Harrisons	Kevin Mock	Judalina Neira & Lauren Certo		May 8, 2018
With DeVoe's Enlightenment device nearly complete, in order to disable it The Flash and his team must put their faith in an unlikely ally - Amunet Black. Meanwhile, Harry hits an all-time low when the "Council of Wells" kicks him out, but then Cisco introduces him to the "Council of Harrisons".
22	Think Fast	Viet Nguyen	Sam Chalsen & Kristen Kim		May 15, 2018
When DeVoe assaults an A.R.G.U.S. facility to complete his Enlightenment Machine, Barry realizes the only way he can stop him is if he allows Cisco and Caitlin to accompany him into the facility. Still shaken by Ralph's death, Barry isn't sure he wants to risk any more of his friends' lives and considers taking on DeVoe solo.
23	We Are The Flash	David McWhirter	Todd Helbing & Eric Wallace		May 22, 2018
Team Flash gets help from a surprising ally in their battle against DeVoe.

Gallery

Logos and Title Cards

• 
  Official Title Card
• 
  Variant Title Card for Crisis on Earth-X, Part 3
• 
  Variant Title Card for We Are The Flash
• 
  Official Logo

Promotional Images

• 
  "Rebirth. Recharged."
• 
  "Catch the Vibe"
• 
  "Frost Warning!"
• 
  "Speeding Toward a Showdown"
• 
  "Let the Mind Games Begin"
• 
  "Save the Date"
• 
  First look at Iris West-Allen's "The Flash" suit
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  "Outmatched? Think Again!"
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  "It Takes A Villain..."
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  "Team Up. Speed Up."
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  "A Mind-Blowing Finale"