The Flash: Season 4

2017
23 episodes

The mission of Barry Allen, aka The Flash, is once more to protect Central City from metahuman threats. But with Barry trapped in the Speed Force, this mission falls to his family – Detective Joe West; fiancée Iris West; and Wally West/Kid Flash – and the team at S.T.A.R. Labs: Caitlin Snow/Killer Frost, Cisco Ramon/Vibe and brilliant scientist Harrison Wells. When a powerful villain threatens to level the city unless The Flash appears, Cisco risks everything to free Barry. But this is only the first move in a deadly game with Clifford DeVoe, aka The Thinker, a mastermind who’s always ten steps ahead of Barry, no matter how fast Barry runs.

Season 4 of The Flash premiered on October 10, 2017 and has 23 episodes, from "The Flash Reborn" to "We Are The Flash". The last episode aired on May 22, 2018.

Where to watch The Flash

In the United States, you can stream The Flash on Netflix. You can also buy it on Google Play Movies and Fandango At Home. It is on streaming services in 125 countries.

Where to watch

Episodes

Episode 1The Flash RebornAired 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.
- 42m
- Directed by Glen Winter
- Written by Andrew Kreisberg, Todd Helbing and Eric Wallace
Guest stars
- Danielle Nicolet Cecile Horton
- Keiynan Lonsdale Wally West / Kid Flash
- Nevin Burkholder Barfly
- Michaela Chalmers Daughter
- Adam O'Neill Male Driver
- Scott Perrie Husband
- Kim Suzanne Engelbrecht Marlize DeVoe / The Mechanic
- Britne Oldford Shawna Baez / Peek-a-Boo
Episode 2Mixed SignalsAired 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.
- 42m
- Directed by Alexandra La Roche
- Written by Gabriel Garza and Jonathan Butler
Guest stars
- Keiynan Lonsdale Wally West / Kid Flash
- Donald Heng Tim Kwon
- Aliza Vellani Shelia Agnani
- Ryan McDonell Kurt Weaver
- Jovanna Huguet Female Realtor
- Barbara Ellison Wealthy Elderly Woman
- Marco Darvasi Uniformed Cop
- Kim Suzanne Engelbrecht Marlize DeVoe / The Mechanic
Episode 3Luck Be a LadyAired 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.
- 42m
- Directed by Armen V. Kevorkian
- Written by Sam Chalsen and Judalina Neira
Guest stars
- Danielle Nicolet Cecile Horton
- Keiynan Lonsdale Wally West / Kid Flash
- Bernard Cuffling Priest #2
- Beau Daniels Priest
- Hannah Drew Bank Teller
- Ryan Elm Plumber
- Chris Foxon Pilot
- Michael Girardin Sweaty Gambler
Episode 4Elongated Journey Into NightAired 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.
- 41m
- Directed by Tom Cavanagh
- Written by Sterling Gates and Thomas Pound
Guest stars
- Hartley Sawyer Ralph Dibny / Elongated Man
- Jason Bell Goon #1
- Peter Chao Millennial
- Chad Riley Goon #2
- Lydia Sarks Female Client
- Danny Trejo Breacher
- Jessica Camacho Gypsy
- Vito D'Ambrosio Mayor Anthony Bellows
Episode 5Girls Night OutAired 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's bachelorette party, while Cisco, Joe and the guys take Barry out for a night on the town.
- 41m
- Directed by Laura Belsey
- Written by Lauren Certo and Kristen Kim
Guest stars
- Danielle Nicolet Cecile Horton
- Hartley Sawyer Ralph Dibny / Elongated Man
- Emily Bett Rickards Felicity Smoak
- Riley Jade Berglund Joanie Horton
- Matt Alfonso Weeper
- Nicholas Bradbury Dude
- Osmond L. Bramble Bouncer
- Sean Kohnke Police Officer #1
Episode 6When Harry Met Harry...Aired November 14, 2017
When collectors of Native American artifacts are attacked by a meta named Mina Chayton 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.
- 42m
- Directed by Brent Crowell
- Written by Gabriel Garza and Jonathan Butler
Guest stars
- Hartley Sawyer Ralph Dibny / Elongated Man
- Joe Kuma Officer #1
- Phoebe Lecky Laura
- Kim Suzanne Engelbrecht Marlize DeVoe / The Mechanic
- Matt Afonso Weeper
- Donna Pescow Dr. Sharon Finkel
- Emmanuel Amadeo Badal Guard #1
- Matthew James Dowden Christoph Banks
Episode 7Therefore I AmAired 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.
- 41m
- Directed by David McWhirter
- Written by Thomas Pound and Eric Wallace
Guest stars
- Keiynan Lonsdale Wally West / Kid Flash
- Paul Batten Dr. Ortiz
- Kim Suzanne Engelbrecht Marlize DeVoe / The Mechanic
- Rob Compton Police Officer #1
- Tiffani Timms Reporter #1
- Neil Sandilands Clifford DeVoe / The Thinker
- Patrick Sabongui David Singh
Episode 8Crisis on Earth-X (III)Aired November 28, 2017
Barry and Iris's 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. The crossover starts on Supergirl S03E08 Crisis on Earth X (I) and Arrow S06E08 Crisis on Earth X (II). It continues on DC's Legends of Tomorrow S03E08 Crisis on Earth X (IV).
- 42m
- Directed by Dermott Downs
- Written by Andrew Kreisberg, Todd Helbing and Marc Guggenheim
Guest stars
- Emily Bett Rickards Felicity Smoak
- Dominic Purcell Mick Rory / Heat Wave
- Franz Drameh Jefferson 'Jax' Jackson / Firestorm
- Jeremy Jordan Winn Schott
- Russell Tovey Ray Terrill / The Ray
- Caity Lotz Sara Lance / White Canary
- Victor Garber Dr. Martin Stein
- Stephen Amell Oliver Queen / Green Arrow / Dark Arrow
Episode 9Don't RunAired 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.
- 42m
- Directed by Stefan Pleszczynski
- Written by Sam Chalsen and Judalina Neira
Guest stars
- Hartley Sawyer Ralph Dibny / Elongated Man
- Kendrick Sampson Dominic Lanse
- Kim Suzanne Engelbrecht Marlize DeVoe / The Mechanic
- Jessica Camacho Gypsy
- Neil Sandilands Clifford DeVoe / The Thinker
- Katee Sackhoff Amunet Black / Blacksmith
- Patrick Sabongui David Singh
Episode 10The Trial of The FlashAired 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.
- 42m
- Directed by Phil Chipera
- Written by Lauren Certo and Kristen Kim
Guest stars
- Danielle Nicolet Cecile Horton
- Hartley Sawyer Ralph Dibny / Elongated Man
- Kendrick Sampson Dominic Lanse
- Mark Valley Anton Slater
- Ryan Alexander McDonald Neil Borman / Fallout
- Kim Suzanne Engelbrecht Marlize DeVoe / The Mechanic
- Mercedes De La Cruz Upper Class Woman
- Bill McNaughton Jury Foreman
Episode 11The Elongated Knight RisesAired 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.
- 42m
- Directed by Alexandra La Roche
- Written by Sterling Gates and Thomas Pound
Guest stars
- Hartley Sawyer Ralph Dibny / Elongated Man
- Devon Graye Axel Walker / The Trickster
- Corinne Bohrer Zoey Clark / Prank
- Bill Goldberg Big Sir / David P. Rachet
- Richard Brooks Warden Gregory Wolfe
- Fraser Aitcheson Prison Gang-Goon #1
- Reese Alexander Prison Guard #2
- Chad Bellamy Prison Gang-Goon #2
Episode 12Honey, I Shrunk Team FlashAired 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.
- 42m
- Directed by Chris Peppe
- Written by Sam Chalsen and Judalina Neira
Guest stars
- Danielle Nicolet Cecile Horton
- Hartley Sawyer Ralph Dibny / Elongated Man
- Bill Goldberg Big Sir / David P. Rachet
- Richard Brooks Warden Gregory Wolfe
- Donna Pescow Dr. Sharon Finkel
- Vito D'Ambrosio Mayor Anthony Bellows
- Kendall Cross Mayor Van Buren
- Kallie Hu Tour Guide
Episode 13True ColorsAired 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.
- 42m
- Directed by Tara Nicole Weyr
- Written by Gabriel Garza and Jonathan Butler
Guest stars
- Danielle Nicolet Cecile Horton
- Hartley Sawyer Ralph Dibny / Elongated Man
- Kendrick Sampson Dominic Lanse
- Kim Suzanne Engelbrecht Marlize DeVoe / The Mechanic
- Richard Brooks Warden Gregory Wolfe
- Paul McGillion Earl Cox
- Jaren Moore Plumber
- Neil Sandilands Clifford DeVoe / The Thinker
Episode 14Subject 9Aired 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.
- 42m
- Directed by Ralph Hemecker
- Written by Mike Alber and Gabe Snyder
Guest stars
- Danielle Nicolet Cecile Horton
- Hartley Sawyer Ralph Dibny / Elongated Man
- Bailey Corneal Detective Addie
- Miranda MacDougall Izzy Bowin
- Kim Suzanne Engelbrecht Marlize DeVoe / The Mechanic
- Sugar Lyn Beard Becky Sharpe / The Thinker
- Kendall Cross Mayor Van Buren
- Patrick Sabongui David Singh
Episode 15Enter FlashtimeAired 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.
- 41m
- Directed by Gregory Smith
- Written by Todd Helbing and Sterling Gates
Guest stars
- Bernadette Saquibal Veronica Dale
- Jessica Parker Kennedy Mystery Girl
- Klarc Jerome Wilson Officer Jones
- Violett Beane Jesse Wells / Jesse Quick
- John Wesley Shipp Jay Garrick / The Flash
Episode 16Run, Iris, RunAired March 13, 2018
Team Flash confront a new bus meta, Matthew aka Melting Pot. He has the ability to swap people’s DNA, so during a battle with Team Flash, he 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.
- 41m
- Directed by Harry Jierjian
- Written by Eric Wallace
Guest stars
- Hartley Sawyer Ralph Dibny / Elongated Man
- Oliver Rice Erik Frye
- Max Adler Jaco Birch
- Koshiki Tanaka Nurse
- Tommy Europe Security Guard
- Leonardo Nam Matthew Kim / Melting Point
Episode 17Null and AnnoyedAired 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.
- 42m
- Directed by Kevin Smith
- Written by Lauren Certo and Kristen Kim
Guest stars
- Hartley Sawyer Ralph Dibny / Elongated Man
- Miranda MacDougall Izzy Bowin
- Kevin Smith Bob the Security Guard
- Jason Mewes Jay the Security Guard
- Kim Suzanne Engelbrecht Marlize DeVoe / The Mechanic
- Danny Trejo Breacher
- Paul McGillion Earl Cox
- Raj Lal Driver
Episode 18Lose YourselfAired 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.
- 42m
- Directed by Hanelle M. Culpepper
- Written by Gabriel Garza and Jonathan Butler
Guest stars
- Hartley Sawyer Ralph Dibny / Elongated Man
- Arturo del Puerto Edwin Gauss / Folded Man
- Miranda MacDougall Izzy Bowin
- Kim Suzanne Engelbrecht Marlize DeVoe / The Mechanic
- Andrew Barber Hippie Guy
- Joel Wirkkunen Bus Driver
- Neil Sandilands Clifford DeVoe / The Thinker
- Bethany Brown Janet Petty / Null
Episode 19Fury RogueAired April 24, 2018
When Barry needs help transporting a dangerous meta, he calls on a new friend for help - Leo Snart AKA Citizen Cold. Meanwhile, Cisco becomes suspicious of Harry.
- 42m
- Directed by Rachel Talalay
- Written by Joshua V. Gilbert and Jeff Hersh
Guest stars
- Ryan Alexander McDonald Neil Borman / Fallout
- Kim Suzanne Engelbrecht Marlize DeVoe / The Mechanic
- Donna Pescow Dr. Sharon Finkel
- Wentworth Miller Leo Snart / Citizen Cold
- Katie Cassidy Laurel Lance / Siren X
- Neil Sandilands Clifford DeVoe / The Thinker
- Morena Baccarin Gideon (voice) (uncredited)
Episode 20Therefore She IsAired May 1, 2018
Barry and Team Flash team up with Gypsy to try to thwart Thinker's plan. Meanwhile, Cisco and Gypsy have a heart to heart talk about their relationship.
- 42m
- Directed by Rob J. Greenlea
- Written by Sterling Gates and Thomas Pound
Guest stars
- Danielle Nicolet Cecile Horton
- Zachary Gulka Security Guard
- Kim Suzanne Engelbrecht Marlize DeVoe / The Mechanic
- Laura Jaye Moderator
- Panta Mosleh Peace Corps Volunteer
- Jessica Camacho Gypsy
- Sean Poague Accelerated Man
- Neil Sandilands Clifford DeVoe / The Thinker
Episode 21Harry and the HarrisonsAired 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."
- 42m
- Directed by Kevin Mock
- Written by Lauren Certo and Judalina Neira
Guest stars
- Leo Chiang Yakuza Baddie
- Mark Sweatman Norvock
- Katee Sackhoff Amunet Black / Blacksmith
Episode 22Think FastAired 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.
- 41m
- Directed by Viet Nguyen
- Written by Sam Chalsen and Kristen Kim
Guest stars
- Danielle Nicolet Cecile Horton
- Patrick Rinehart A.R.G.U.S. Guard
- Ryan Alexander McDonald Neil Borman / Fallout
- Kim Suzanne Engelbrecht Marlize DeVoe / The Mechanic
- Donna Pescow Dr. Sharon Finkel
- Victoria Askounis Young Caitlin
- Adil Zaidi A.R.G.U.S. Scientist
- Nathan Barrett Pizza Dude
Episode 23We Are The FlashAired May 22, 2018
Team Flash gets help from a surprising ally in their battle against DeVoe.
- 42m
- Directed by David McWhirter
- Written by Todd Helbing and Eric Wallace
Guest stars
- Danielle Nicolet Cecile Horton
- Keiynan Lonsdale Wally West / Kid Flash
- Hartley Sawyer Ralph Dibny / Elongated Man
- Kim Suzanne Engelbrecht Marlize DeVoe / The Mechanic
- Neil Sandilands Clifford DeVoe / The Thinker
- Jessica Parker Kennedy Mystery Girl
- Patrick Sabongui David Singh