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The Best Episodes of The Flash Season 1

Every episode of The Flash Season 1 ranked from best to worst. Discover the Best Episodes of The Flash Season 1!

Binge this in 15h 49m·Peaking at 9.6/10
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Episode Rankings

  1. #1 Fan Favorite
    The Flash Season 1 Episode 15 - Out of Time
    9.6/10(16773 votes)

    S1:E15

    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.

    Director:Thor Freudenthal
    Writers:Todd Helbing, Aaron Helbing

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  2. The Flash Season 1 Episode 23 - Fast Enough
    9.5/10(14442 votes)

    S1:E23

    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.

    Director:Dermott Downs
    Writer:Unknown

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  3. The Flash Season 1 Episode 20 - The Trap
    9.3/10(8677 votes)

    S1:E20

    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.

    Director:Steve Shill
    Writers:Alison Schapker, Brooke Roberts

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  4. The Flash Season 1 Episode 9 - The Man in the Yellow Suit
    9.2/10(9950 votes)

    S1:E9

    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.

    Director:Ralph Hemecker
    Writers:Todd Helbing, Aaron Helbing

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  5. The Flash Season 1 Episode 8 - Flash vs. Arrow (I)
    9.1/10(10252 votes)

    S1:E8

    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.

    Director:Glen Winter
    Writer:Unknown

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  6. The Flash Season 1 Episode 17 - Tricksters
    9.0/10(8035 votes)

    S1:E17

    When a villain calling himself the Trickster runs rampant in Central City, Joe and Barry go to Iron Heights to talk with the original Trickster.

    Director:Ralph Hemecker
    Writer:Andrew Kreisberg

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  7. The Flash Season 1 Episode 22 - Rogue Air
    9.0/10(8058 votes)

    S1:E22

    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.

    Director:Douglas Aarniokoski
    Writers:Todd Helbing, Aaron Helbing

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  8. The Flash Season 1 Episode 19 - Who Is Harrison Wells?
    8.9/10(7421 votes)

    S1:E19

    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.

    Director:Wendey Stanzler
    Writers:Ray Utarnachitt, Cortney Norris

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  9. The Flash Season 1 Episode 14 - Fallout
    8.7/10(7043 votes)

    S1:E14

    Martin and Ronnie are separated, only to realize that they must learn how to rejoin before Eiling hunts them down and kills them... and the Flash. Meanwhile, Joe shows Barry the 3D images from the Nora Allen crime scene, and Barry asks Martin for advice on time travel.

    Director:Stephen Surjik
    Writers:Ben Sokolowski, Keto Shimizu

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  10. The Flash Season 1 Episode 13 - The Nuclear Man
    8.5/10(6652 votes)

    S1:E13

    While Barry, Harrison, and Caitlin hunt down Ronnie, who has attacked a man, Joe recruits Cisco to help him learn the truth about who murdered Nora Allen.

    Director:Glen Winter
    Writers:Katherine Walczak, Andrew Kreisberg

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  11. The Flash Season 1 Episode 4 - Going Rogue
    8.4/10(7835 votes)

    S1:E4

    The Flash battles Captain Cold after the villain is involved in a robbery and plots to steal the Kahndaq Dynasty Diamond.

    Director:Glen Winter
    Writers:Kai Yu Wu, Geoff Johns

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  12. The Flash Season 1 Episode 1 - Pilot
    8.3/10(10883 votes)

    S1:E1

    Barry discovers his powers and puts them to the test, only when he finds its no longer a test but the real thing when he encounters a certain someone.

    Director:David Nutter
    Writer:Unknown

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  13. The Flash Season 1 Episode 7 - Power Outage
    8.3/10(6879 votes)

    S1:E7

    The Flash goes up against Farooq aka Blackout, a metahuman who can harness electricity.

    Director:Larry Shaw
    Writers:Alison Schapker, Grainne Godfree

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  14. The Flash Season 1 Episode 16 - Rogue Time
    8.3/10(6743 votes)

    S1:E16

    The Flash learns that Captain Cold and Heat Wave have returned to Central City. This time Snart has brought along his baby sister Lisa to help wreak havoc on the city.

    Director:John Behring
    Writer:Unknown

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  15. The Flash Season 1 Episode 6 - The Flash is Born
    8.2/10(6987 votes)

    S1:E6

    The Flash faces a new meta-human named Tony, who can turn himself into girded steel at will.

    Director:Millicent Shelton
    Writers:Jaime Paglia, Chris Rafferty

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  16. The Flash Season 1 Episode 12 - Crazy for You
    8.2/10(6515 votes)

    S1:E12

    Caitlin takes Barry out to a local karaoke bar to help them both find new loves. Caitlin strikes out but Barry meets a sports reporter and asks her out for a date. Meanwhile, Cisco considers Hartley's dangerous offer; and the team search for Shawna, a meta-human with teleportation powers who just busted her boyfriend out of Iron Heights.

    Director:Rob Hardy
    Writers:Todd Helbing, Aaron Helbing

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  17. The Flash Season 1 Episode 21 - Grodd Lives
    8.2/10(6710 votes)

    S1:E21

    While Barry tries to find Eddie, a mysterious mind-controlled thief launches attacks on Central City's gold reserves. The team soon discovers that a telepathic gorilla is behind the robberies... and is following Harrison's commands. Meanwhile, Iris confronts Barry, while Harrison prepares to return home.

    Director:Dermott Downs
    Writers:Grainne Godfree, Kai Yu Wu

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  18. The Flash Season 1 Episode 2 - Fastest Man Alive
    8.1/10(8355 votes)

    S1:E2

    Barry changes into the Flash when six gunmen storm a university event honoring a scientist, but his heroics don't match up to his expectations. Meanwhile, Iris becomes even more intrigued by the "red streak."

    Director:David Nutter
    Writer:Unknown

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  19. The Flash Season 1 Episode 10 - Revenge of the Rogues
    8.1/10(6729 votes)

    S1:E10

    While Barry strives to become fast enough to defeat Reverse-Flash, Captain Cold returns to Central City with a partner and takes Caitlin hostage to force a confrontation with the Flash.

    Director:Nick Copus
    Writers:Kai Yu Wu, Geoff Johns

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  20. The Flash Season 1 Episode 18 - All Star Team Up
    8.1/10(6585 votes)

    S1:E18

    Felicity and Ray Palmer pay a visit to S.T.A.R. Labs for help getting Ray's ATOM suit to work, and ask Cisco for help. Meanwhile, a young tech expert raises havoc with her insect drones, and Barry asks Ray for help dealing with her.

    Director:Kevin Tancharoen
    Writers:Grainne Godfree, Kai Yu Wu

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  21. The Flash Season 1 Episode 11 - The Sound and the Fury
    8.0/10(6350 votes)

    S1:E11

    Dr. Wells' former protégé, Hartley Rathaway, returns to seek revenge on his mentor. Meanwhile, Iris is hired as a cub reporter; Cisco recalls his first day on the job at S.T.A.R. Labs; and Joe asks Eddie for a favor but asks him to keep it a secret from Barry.

    Director:John F. Showalter
    Writers:Alison Schapker, Brooke Roberts

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  22. The Flash Season 1 Episode 3 - Things You Can't Outrun
    7.9/10(7615 votes)

    S1:E3

    Barry and the team go after the Mist, who possesses toxic gas powers, and they reflect on the night Caitlin's fiancé died. Meanwhile, Henry gets a long-awaited visit from Joe, and Iris and Eddie continue to keep their romance a secret from Joe.

    Director:Jesse Warn
    Writers:Alison Schapker, Grainne Godfree

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  23. The Flash Season 1 Episode 5 - Plastique
    7.9/10(7062 votes)

    S1:E5

    After a bomb explodes downtown, the army rolls in and takes over. When Joe learns Iris is writing about 'The Streak' and tries unsuccessfully to have the story stopped, Barry decides to have The Flash pay her a visit.

    Director:Dermott Downs
    Writers:Todd Helbing, Brooke Roberts, Aaron Helbing

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Season 1 Ratings Summary

"Out of Time" is the best rated episode of The Flash season 1. It scored 9.6/10 from 16,773 votes. Directed by Thor Freudenthal and written by Todd Helbing, Aaron Helbing, it aired on March 17, 2015. This episode is rated 0.1 points higher than the second-best, "Fast Enough".