The Flash

10 Best Episodes of The Flash

The Flash, a popular superhero TV show, has captured the hearts of millions of viewers since its premiere in 2014 on The CW. With 11 seasons to date, fans have been treated to a plethora of thrilling and action-packed episodes, leaving them at the edge of their seats. In this article, we will be taking a look at the best episodes of The Flash, ranked by viewers.

The show follows Barry Allen, a CSI Investigator who gains the power of super speed after being struck by lightning during a freak storm caused by a particle accelerator. As he partners with S.T.A.R. Labs to protect Central City from other meta-humans who use their powers for evil, Barry's story has captured the attention of viewers worldwide. From the first episode to the latest, The Flash has kept fans on the edge of their seats with its gripping plotlines, iconic characters, and stunning action scenes.

As fans eagerly await the next season, we have compiled a list of the top episodes of The Flash ranked by viewers. These episodes will take you on a journey through the show's most memorable moments, from epic battles to heart-warming scenes that showcase the strength of Barry's relationships with his friends and family. So sit back, grab your popcorn and get ready to relive some of the most unforgettable moments in The Flash history.

Written by Sophie and last updated on jun 26, 2023.

PS: The following content contains spoilers!

PPS: I will admit that parts of this page was written with the help of AI - it makes my work so much easier to not start from a blank page!

The Flash - S3E8

#15 - Invasion! (II) (Season 3 - Episode 8)

When aliens called the Dominators attack Central City, Barry speeds over to Star City to ask the Green Arrow for help in stopping them. Realizing the battle against the Dominators is bigger than they thought, they track down the Legends of Tomorrow, and Barry and Cisco create a breach to bring back a secret weapon – Supergirl. Once all of the super friends are assembled, they come up with a plan to attack but a shocking secret related to Flashpoint is revealed and suddenly no one is sure who they can trust. Meanwhile, Wally wants to join the battle against the aliens but Iris tells him he’s not ready. The crossover starts on Supergirl S02E08 Medusa (I). It continues on Arrow S05E08 Invasion! (III) and DC's Legends of Tomorrow S02E07 Invasion! (IV).

The episode was rated 8.08 from 6351 votes.

The Flash - S2E22

#14 - Invincible (Season 2 - Episode 22)


After Zoom unleashes an army of Earth-2 meta-humans on Central City, Barry is shaken when he sees their leader is the Black Canary’s Earth-2 doppelganger, the Black Siren. Meanwhile, Wally takes to the streets to help The Flash stop the meta-humans, which worries Joe. Iris and Henry are concerned about Barry taking on Zoom.

The episode was rated 8.08 from 5607 votes.

The Flash - S2E14

#13 - Escape from Earth-2 (Season 2 - Episode 14)

On Earth-2, the team races to find Zoom's lair and asks for help from the most unexpected source. Meanwhile, back on Earth-1, Caitlin rushes to perfect Velocity-9 so that Jay can stop the Geomancer.

The episode was rated 8.09 from 4727 votes.

The Flash - S5E9

#12 - Elseworlds (I) (Season 5 - Episode 9)


When Barry Allen and Oliver Queen wake up one morning and realize they have swapped bodies with each other, the two set off to find out what disturbed the timeline to cause such a shift. However, things quickly go from bad to worse when they present their case to Team Flash and the gang doesn’t believe them. Barry and Oliver realize they need Supergirl’s help and travel to Smallville on Earth-38 where they end up meeting Kara’s cousin, Clark Kent, and intrepid reporter, Lois Lane. The crossover continues on Arrow S07E09 Elseworlds (II) and Supergirl S04E09 Elseworlds (III).

The episode was rated 8.09 from 2268 votes.

The Flash - S2E13

#11 - Welcome to Earth-2 (Season 2 - Episode 13)

Barry, Wells and Cisco journey to Earth-2 to rescue Wells’ daughter, Jesse from Zoom. Barry is stunned when he runs into Earth-2 Iris and Joe, but nothing prepares him for meeting Killer Frost and Deathstorm. Meanwhile, back on Earth-1, Jay has to take over the Flash’s responsibilities when a meta-human nicknamed Geomancer attacks Central City.

The episode was rated 8.10 from 4724 votes.

The Flash - S3E20

#10 - I Know Who You Are (Season 3 - Episode 20)


Barry and the team meet Tracy Brand, a scientist, who may be the key to stopping Savitar. Unfortunately, Killer Frost is also after Tracy so Team Flash must battle their old friend, which proves to be particularly difficult for Cisco. Joe and Cecile’s relationship takes a big turn.

The episode was rated 8.10 from 5897 votes.

The Flash - S1E19

#9 - Who Is Harrison Wells? (Season 1 - Episode 19)

Joe and Cisco go to Starling City to ask Quentin Lance for his help investigating the site of Harrison's car accident 15 years ago and determining what really happened. Meanwhile, Eddie is framed for a shooting by a shapeshifing metahuman who can take on the appearance of anyone he touches.

The episode was rated 8.13 from 3839 votes.

The Flash - S2E6

#8 - Enter Zoom (Season 2 - Episode 6)


After recent events, Barry decides it’s time to confront Zoom and comes up with a dangerous plan. Caitlin sides with Jay and deems it too dangerous for Barry to engage with the speed demon. However, Iris shows her support and brings forth a surprising ally. We see what Earth-2 Harrison Wells’ life was like before coming through the breech.

The episode was rated 8.14 from 4370 votes.

The Flash - S1E8

#7 - Flash vs. Arrow (I) (Season 1 - Episode 8)

Barry is thrilled when Oliver, Felicity and Diggle come to Central City to investigate a case involving a deadly boomerang. The crossover continues on Arrow S03E08 The Brave and the Bold.

The episode was rated 8.16 from 3735 votes.

The Flash - S1E22

#6 - Rogue Air (Season 1 - Episode 22)


When Harrison activates the particle accelerator, the team has no choice but to evacuate the five metahuman prisoners. Unfortunately, with time running out, Barry has no choice but to turn to Captain Cold for help. Meanwhile, Eddie escapes but has some surprising news for Iris.

The episode was rated 8.17 from 3482 votes.

The Flash - S2E23

#5 - The Race of His Life (Season 2 - Episode 23)

After Zoom reveals his true plan, Barry vows to do whatever it takes to stop him.

The episode was rated 8.20 from 5859 votes.

The Flash - S1E9

#4 - The Man in the Yellow Suit (Season 1 - Episode 9)


Barry enjoys the annual tradition of tree trimming and gift exchange with Joe and Iris. He gives Iris a touching gift, but the moment is interrupted by Eddie’s arrival.

The episode was rated 8.23 from 3564 votes.

The Flash - S1E20

#3 - The Trap (Season 1 - Episode 20)

Barry, Caitlin, Cisco and Joe set a trap for Wells. Cisco uses himself as prey which puts him in grave danger. Meanwhile, Eddie makes a decision regarding Iris, which leaves Joe a bit unsettled.

The episode was rated 8.27 from 3875 votes.

The Flash - S1E15

#2 - Out of Time (Season 1 - Episode 15)


Mark Mardon, having survived his apparent death during the black-matter explosion, returns seeking revenge on Joe for the death of his brother Clyde... and has the same weather-manipulation powers as his deceased sibling.

The episode was rated 8.40 from 4008 votes.

The Flash - S1E23

#1 - Fast Enough (Season 1 - Episode 23)

Wells presents Barry with a life-changing choice. Dr. Martin Stein and Ronnie Raymond return to help the S.T.A.R. Labs team with this final fight.

The episode was rated 8.44 from 3935 votes.

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