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Season 4 – The Flash

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0:29

Oct 2017

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Action

Adventure

Fantasy

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Popcornmeter

80%

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221 Reviews

50%

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1,000+ Ratings

At 11, Barry Allen's life changed completely when his mother died in a freak accident and his innocent father was convicted of her murder. Now a crime-scene investigator, his dedication to learn the truth about his mother's death drives him to follow up on every new scientific advancement and urban legend. When his latest obsession -- a particle accelerator heralded as a world-changing invention -- causes an explosion, it creates a freak storm and Barry is struck by lightning. He awakes from a coma nine months later with the power of superspeed. When he learns that others who have gained powers use them for evil, he dedicates himself to protecting the innocent, while still trying to solve the older mystery.

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Critics Consensus

After an unsteady turn in season three, The Flash returns to its roots with a fourth season packed with humor, spectacle, and a whole lot of heart.

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Allison Shoemaker

AV Club

May 2, 2018

C+

Perhaps I'm the only one who feels this way, but the decision to dispense with the meat of the story to skip to the end seems pretty familiar, no?

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Autumn Noel Kelly

Newsweek

Mar 26, 2018

The Flash Season 4 episode 16, 'Run Iris, Run,' is one of the most exciting moments in series history.

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Allison Keene

Collider

Oct 14, 2017

3/5

It's hard to dislike Grant Gustin, who has such a natural charisma, but the show surely tried. Now, it's letting him have fun again with inventive speedster sequences, new ways of battling foes, as well as familiar interactions among the team.

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David Hogan

hoganreviews.co.uk

Feb 17, 2019

4/5

The overall storyline plays out well over the 23 episodes, and most of the characters get something to do. A good return to form for The Flash.

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John Hanlon

John Hanlon Reviews

Nov 19, 2018

3.0/4

A solid season but it's disappointing to see some of the supporting players sidelined here.

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Jeff Beck

The Blu Spot

Aug 29, 2018

4/5

Enriched with its compelling characters and intricate storytelling, the show remains a shining example of how superheroes on the small screen can easily compete with, and in many cases surpass, their big screen counterparts in terms of quality.

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stevko O

@EldoradoAvocado Sep 29, 2026

Unfortunately, I remembered this show existed. As bad as the writing was in earlier seasons, the show still remained somewhat enjoyable. That is not the case anymore. Contradictions on top of contradictions on top of contradictions. This isn't just about the writers having no passion, no talent and no respect for their viewers. This is about them being some of the dumbest people alive. They simply do not have enough brain power to maintain a thought for longer than 3sec. I've seen She-Hulk and Ironheart, and I'm still confident in saying that this is the worst superhero show that I've ever seen.

Riley K

@Primeditz Jun 29, 2026

This is when it all started to go down hill. Don’t get me wrong Season 4 was still good. It just wasn’t absolutely peak like the first 3 seasons. The Thinker is a very intriguing villain and he in my opinion is the only non speedster villain that can believably defeat The Flash. With that said Barry should’ve have been in this season, Wally should’ve become The Flash and they should’ve adapted his most famous comic “The Return of Barry Allen” where “Barry Allen” returns but in reality it’s actually Eobard Thawne trying to ruin Barry’s legacy. This should’ve been the beginning of Wally’s run as The Flash but instead they put him on Legends of Tomorrow it’s not forgivable. Despite this there’s some very high highs in this season and it’s overall a decent story and the ending is pretty satisfying and actually sets up Season 5 very nicely.

Sage T

@Fcknlayars Dec 5, 2025

More like dumbest man alive. This show is the worst thing on earth and if you don't believe me, see for yourself https://youtu.be/bZGuHJLMxUo?si=xw-yZCGCgTEWg5Tf

Esli M

@Esli9187 Jul 20, 2025

The best story with the best characters like ralph dibny the elongated man and the amazing villain thinker. It was filled with emotions and the suit got so much better.

stefan C

@RT89536469 May 4, 2025

De serie is erg herhalend en langdradig. Het was beter geweest als het minder Afleveringen had dat geld voor de hele Arrowverse. De vijand is wel goed! Verder is het best een goed seizoen.

Josiah H

@RT47731746 Nov 28, 2024

This season was so bad ngl

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Alexandra La Roche

Director

Gregory Smith

Director

Laura Belsey

Director

Ralph Hemecker

Director

David McWhirter

Director

Grant Gustin

Barry Allen

Episode 1

Aired Oct 10, 2017

The Flash Reborn

With Barry in the speed force, Iris, Kid Flash, Joe, and Vibe must protect Central City; a powerful armored villain threatens to level the city if the Flash doesn't appear; Cisco decides to break Barry out of the speed force.

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Episode 2

Aired Oct 17, 2017

Mixed Signals

Barry has his hands full when he takes on a dangerous meta who can control technology; Gypsy breaches in for a date with Cisco, getting annoyed when his work keeps them apart.

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Episode 3

Aired Oct 24, 2017

Luck Be a Lady

Barry and the team experience a string of bad luck and discover it is caused by a new metahuman; Harry Wells returns to Earth-1 to give Wally a message from Jesse.

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Episode 4

Aired Oct 31, 2017

Elongated Journey Into Night

Cisco is shocked when Gypsy's father shows up and takes an immediate disliking to Cisco; Barry runs into Ralph Dibny, his former nemesis.

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Episode 5

Aired Nov 7, 2017

Girls Night Out

Caitlin receives an ominous threat from her old boss; Felicity arrives to help the girls celebrate Iris's bachelorette party; Cisco, Joe, and the guys take Barry out for a night on the town.

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Episode 6

Aired Nov 14, 2017

When Harry Met Harry...

When Native American artifact collectors are attacked by a meta who can bring inanimate objects to life, Barry turns to a surprising ally for help; Harry enlists Cisco's help to determine the identity of The Thinker.

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Episode 7

Aired Nov 21, 2017

Therefore I Am

Barry comes face to face with DeVoe; DeVoe's past is revealed; Iris puts the final touches on the wedding, only one week away.

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Episode 8

Aired Nov 28, 2017

Crisis on Earth-X

Barry and Iris' wedding brings the gang together, but things go awry when villains from Earth-X attack the ceremony.

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Episode 9

Aired Dec 5, 2017

Don't Run

Amunet threatens to kill Caitlin if she doesn't help perform a tricky medical task; The Thinker traps The Flash in a speedster-proof prison; Iris is forced to choose whether to save Caitlin or Barry.

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Episode 10

Aired Jan 16, 2018

The Trial of The Flash

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.

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Episode 11

Aired Jan 23, 2018

The Elongated Knight Rises

A familiar villain returns to terrorize Central City; Ralph must rise up to defend the innocent while Barry is detained by his trial; Barry searches for the strength to keep his optimism alive in the face of his new circumstances.

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Episode 12

Aired Jan 30, 2018

Honey, I Shrunk Team Flash

A meta, who can shrink anything, leaves Cisco and Ralph as miniature versions of themselves; Cecile makes a discovery that unnerves Joe.

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Episode 13

Aired Feb 6, 2018

True Colors

After hearing that Amunet has struck a deal to buy all the metahumans in Iron Heights, Barry must decide if he should expose his powers to save his cellmates.

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Episode 14

Aired Feb 27, 2018

Subject 9

Barry meets a powerful woman whose abilities could help him in his battle with DeVoe; after learning that DeVoe is targeting everyone who was on the bus, Ralph decides he doesn't want to be a hero anymore.

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Episode 15

Aired Mar 6, 2018

Enter Flashtime

When a nuclear bomb detonates in downtown Central City, Barry, Jesse Quick and Jay Garrick slow down time by entering Flashtime.

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Episode 16

Aired Mar 13, 2018

Run, Iris, Run

Team Flash confronts a meta who has the ability to swap people's DNA; Barry's speed is accidentally given to Iris; Barry must act as the team leader, and Iris takes on the mantle of superhero speedster to defeat the new foe.

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Episode 17

Aired Apr 10, 2018

Null and Annoyed

Barry and Ralph take different approaches to finding the remaining metas before DeVoe gets to them; Ralph's cavalier attitude frustrates Barry and the two clash over what it means to be a hero; Breacher returns to ask Cisco for a favor.

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Episode 18

Aired Apr 17, 2018

Lose Yourself

Barry and the team find a way into the Thinker's lair; Ralph considers crossing a dangerous line to defeat him; Joe is concerned by Harry's recent behavior.

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Episode 19

Aired Apr 24, 2018

Fury Rogue

When Barry needs help transporting a dangerous meta, he calls on a new friend named Leo Snart for help; Cisco becomes suspicious of Harry.

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Episode 20

Aired May 1, 2018

Therefore She Is

Barry teams up with Gypsy to thwart the Thinker's plan; Cisco and Gypsy discuss their relationship.

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Episode 21

Aired May 8, 2018

Harry and the Harrisons

The Flash and his team put their faith in an unlikely ally, Amunet Black, to defeat DeVoe; Harry hits an all-time low when the "Council of Wells" kicks him out, but then Cisco introduces him to the "Council of Harrisons."

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Episode 22

Aired May 15, 2018

Think Fast

DeVoe assaults an A.R.G.U.S. facility to complete his Enlightenment Machine; Barry realizes the only way to stop DeVoe is to allow his friends to help; Barry is reluctant to risk his friends' lives and considers taking on DeVoe solo.

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Episode 23

Aired May 22, 2018

We Are the Flash

The team gets help from a surprising ally in their battle against DeVoe.

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