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The Best Episodes Of 'The Flash' 

Ranker TV
Updated May 12, 2020 12.2k votes 986 voters 11k views 134 items

There are so many good episodes of The Flash, but which ones really stand out? Do you like "Fast Enough" the best, or is "Flash vs. Arrow" your favorite episode of The Flash? To determine once and for all what the best episodes of The Flash are, let's rank every episode of The Flash from best to worst.

The Flash on CW is a superhero TV series based on the DC Comics character Barry Allen, AKA Flash. Starring Grant Gustin as the eponymous hero, The Flash was conceived as a spinoff of Arrow (Green Arrow). The series premiered on October 7, 2014 and has had crossover episodes with both Arrow and Supergirl. The series is critically acclaimed, with the second season having a perfect 100% score on Rotten Tomatoes.

Vote up your favorite episodes of The Flash, and vote down any bad episodes that you really didn't enjoy, despite how much you love the series as a whole. It can be painful to put one The Flash episode over the other when there are so many good ones, which is why you can vote on however many episodes you like.

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list ordered by
1
Out Of Time is listed (or ranked) 1 on the list The Best Episodes Of 'The Flash'

Original Airing: March 17, 2015

Season 1, Episode 15

Mark Mardon aka The Weather Wizard appears in Central City to avenge his brother's death at the hands of Joe. And Cisco realizes that Dr. Wells is hiding something.

2
Fast Enough is listed (or ranked) 2 on the list The Best Episodes Of 'The Flash'

Original Airing: May 19, 2015

Season 1, Episode 23

In the season one finale, Wells presents Barry with a life-altering choice, while Dr. Martin Stein and Ronnie Raymond (aka Firestorm) return to help the S.T.A.R. Labs team.

3
The Man In The Yellow Su... is listed (or ranked) 3 on the list The Best Episodes Of 'The Flash'

Original Airing: December 9, 2014

Season 1, Episode 9

When Barry finds himself face to face with his nemesis, the Man in the Yellow Suit (aka Reverse Flash), who killed his mother, he turns to Dr. Tina McGee (AMANDA PAYS) for help.

4
Enter Zoom is listed (or ranked) 4 on the list The Best Episodes Of 'The Flash'

Original Airing: November 10, 2015

Season 2, Episode 6

Barry comes up with a dangerous plan to defeat Zoom. Although Caitlin sides with Jay and deems it too dangerous, Iris shows her support with a surprising ally.

5
Pilot is listed (or ranked) 5 on the list The Best Episodes Of 'The Flash'

Original Airing: October 7, 2014

Season 1, Episode 1

In the series premiere, Central City forensic scientist Barry Allen (GRANT GUSTIN) is accidentally given the power of super speed in a freak particle accelerator accident.

6
Flash Back is listed (or ranked) 6 on the list The Best Episodes Of 'The Flash'

Original Airing: March 29, 2016

Season 2, Episode 17

Determined to stop Zoom forever by increasing his speed, Barry travels back in time to consult his former mentor/nemesis Harrison Wells/Eobard Thawne.

7
The Race Of His Life is listed (or ranked) 7 on the list The Best Episodes Of 'The Flash'

Original Airing: May 24, 2016

Season 2, Episode 23

In the Season Two finale, Zoom reveals his true plan and Barry vows to do whatever it takes to stop him.

8
Infantino Street is listed (or ranked) 8 on the list The Best Episodes Of 'The Flash'

Original Airing: May 16, 2017

Season 3, Episode 22

With only 24 hours left to save Iris from Savitar, Barry decides to use any means necessary and turns to Captain Cold (WENTWORTH MILLER) for help.

9
The Trap is listed (or ranked) 9 on the list The Best Episodes Of 'The Flash'

Original Airing: April 28, 2015

Season 1, Episode 20

Barry, Caitlin, Cisco & Joe set a trap for Wells - using Cisco as bait. Meanwhile, Eddie makes a decision regarding Iris that leaves him unsettled.

10
Flash Vs. Arrow is listed (or ranked) 10 on the list The Best Episodes Of 'The Flash'

Original Airing: December 2, 2014

Season 1, Episode 8 

In the first part of the epic crossover event with The Flash and Arrow, Barry is thrilled when Oliver, Felicity and Diggle join him in Central City to help stop a meta-human.

11
Welcome To Earth-2 is listed (or ranked) 11 on the list The Best Episodes Of 'The Flash'

Original Airing: February 9, 2016

Season 2, Episode 13

Barry, Wells & Cisco journey to Earth-2 to rescue Wells' daughter, Jesse, and Barry's stunned when he meets Killer Frost (DANIELLE PANABAKER) and Deathstorm (ROBBIE AMELL).

12
Crisis On Earth-X, Part ... is listed (or ranked) 12 on the list The Best Episodes Of 'The Flash'

Original Airing: November 28, 2017

Season 4, Episode 8

When villains from Earth-X attack the wedding ceremony of Barry and Iris, the Green Arrow, Supergirl, The Flash and White Canary unite their teams to save the world.

13
Who Is Harrison Wells? ... is listed (or ranked) 13 on the list The Best Episodes Of 'The Flash'

Original Airing: April 21, 2015

Season 1, Episode 19

While Joe and Cisco head to Starling City for answers about Dr. Wells from Capt. Lance, Barry races to catch a meta-human who can transform into anyone he touches.

14
Rogue Air is listed (or ranked) 14 on the list The Best Episodes Of 'The Flash'

Original Airing: May 12, 2015

Season 1, Episode 22

As Wells once again gets the upper hand on the S.T.A.R. Labs team, Barry reaches out to an old foe, Captain Cold, and friends, the Arrow and Firestorm, for help.

15
Escape From Earth-2 is listed (or ranked) 15 on the list The Best Episodes Of 'The Flash'

Original Airing: February 16, 2016

Season 2, Episode 14

In the conclusion to their Earth-2 journey, the team races to find Zoom's lair by asking for help from an unexpected source. Back on Earth-1, Caitlin rushes to perfect Velocity-9.

16
Invasion! is listed (or ranked) 16 on the list The Best Episodes Of 'The Flash'

Original Airing: November 29, 2016

Season 3, Episode 8

When aliens called the Dominators attack Central City, Barry asks for help from the Green Arrow, the Legends of Tomorrow and Supergirl in the first part of the epic crossover event.

17
The Runaway Dinosaur is listed (or ranked) 17 on the list The Best Episodes Of 'The Flash'

Original Airing: May 10, 2016

Season 2, Episode 21

With Barry gone, the team must figure out a way to handle the return of an old enemy - Girder (GREG FINLEY), by trying to trap him in S.T. A. R. Labs.

18
The Once And Future Flas... is listed (or ranked) 18 on the list The Best Episodes Of 'The Flash'

Original Airing: April 25, 2017

Season 3, Episode 19

Barry travels to the future to find out Savitar’s identity in hopes of finding Iris, but in 2024, he encounters future versions of Team Flash who are very different people.

19
Tricksters is listed (or ranked) 19 on the list The Best Episodes Of 'The Flash'

Original Airing: March 31, 2015

Season 1, Episode 17

MARK HAMILL (Star Wars) reprises his role as James Jesse aka The Trickster, when a copycat killer (DEVON GRAYE) starts setting bombs off in Central City.

20
The Reverse-Flash Return... is listed (or ranked) 20 on the list The Best Episodes Of 'The Flash'

Original Airing: January 26, 2016

Season 2, Episode 11

When Cisco gets a vibe of Eobard Thawne, Barry and the team don't believe it. But, after an attack at Mercury Labs, Christina McGee confirms that the Reverse-Flash is back.

21
I Know Who You Are is listed (or ranked) 21 on the list The Best Episodes Of 'The Flash'

Original Airing: May 2, 2017

Season 3, Episode 20

Barry and the team meet Tracy Brand (ANNE DUDEK), a scientist, who may be the key to stopping Savitar. Unfortunately, Killer Frost is also after Tracy.

22
Killer Frost is listed (or ranked) 22 on the list The Best Episodes Of 'The Flash'

Original Airing: November 22, 2016

Season 3, Episode 7

In order to save Barry, Caitlin uses her powers, but the effort unleashes her inner Killer Frost, who ends up battling both The Flash and Vibe. Kevin Smith directs.

23
Therefore I Am is listed (or ranked) 23 on the list The Best Episodes Of 'The Flash'

Original Airing: November 14, 2017

Season 4, Episode 7

Barry comes face to face with DeVoe (NEIL SANDILANDS), whose past is revealed through flashbacks. Meanwhile, Iris puts the final touches on the wedding, which is a week away.

24
The Flash Reborn is listed (or ranked) 24 on the list The Best Episodes Of 'The Flash'

Original Airing: October 10, 2017

Season 4, Episode 1

In the season four premiere, Cisco (CARLOS VALDES) makes a risky decision to break Barry (GRANT GUSTIN) out of the Speed Force.

25
Into the Speed Force is listed (or ranked) 25 on the list The Best Episodes Of 'The Flash'

Original Airing: March 14, 2017

Season 3, Episode 16

Desperate to stop Savitar and save his friends, Barry turns to the speed force for answers. Meanwhile, H.R. gives Jesse some advice.