8.5/1021 votesLoading...#1 - What's Past Is Prologue
Season 5 Episode 8 - Aired 12/4/2018
Barry and Team Flash come up with a plan to stop Cicada. However, the plan calls for Barry and Nora to travel back in time to gather some key necessities. However, Barry hesitates, concerned about his daughter seeing certain parts of his life. Meanwhile, Sherloque takes his concerns about Nora to Iris, and Caitlin turns up a key asset in the fight against Cicada.
Director: Tom Cavanagh
Writer: Todd Helbing, Lauren Certo
8.5/104 votesLoading...#2 - It's My Party and I'll Die If I Want To
Season 9 Episode 9 - Aired 4/26/2023
Team Flash throws a surprise birthday party for Barry, but things go terribly awry when Ramsey Rosso crashes the festivities.
Director: Danielle Panabaker
Writer: Sam Chalsen, Emily Palizzi
8.4/1055 votesLoading...#3 - Out of Time
Season 1 Episode 15 - Aired 3/17/2015
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
Writer: Aaron Helbing, Todd Helbing
8.4/1047 votesLoading...#4 - Fast Enough
Season 1 Episode 23 - Aired 5/19/2015
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: N/A
8.4/1023 votesLoading...#5 - Elseworlds (I)
Season 5 Episode 9 - Aired 12/9/2018
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).
Director: Kevin Tancharoen
Writer: Sam Chalsen, Eric Wallace
8.3/1024 votesLoading...#6 - Infantino Street
Season 3 Episode 22 - Aired 5/16/2017
With only 24 hours left until Savitar murders Iris, Barry struggles to save the woman he loves and makes the choice to use any means necessary to do so. Realizing he has one option left to save her, The Flash turns to Captain Cold for help.
Director: Michael A. Allowitz
Writer: N/A
8.3/1020 votesLoading...#7 - Enter Flashtime
Season 4 Episode 15 - Aired 3/6/2018
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.
Director: Gregory Smith
Writer: Todd Helbing, Sterling Gates
8.2/104 votesLoading...#8 - A New World (1)
Season 9 Episode 10 - Aired 5/3/2023
As Iris receives word of a career milestone, Barry is suddenly nowhere to be found. In trying to get back home, Barry runs across many familiar faces. Khione continues to figure out her powers, and Chester works on a suit for Allegra.
Director: Eric Wallace
Writer: Thomas Pound, Eric Wallace
8.1/1048 votesLoading...#9 - The Man in the Yellow Suit
Season 1 Episode 9 - Aired 12/9/2014
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
Writer: Aaron Helbing, Todd Helbing
8.1/1046 votesLoading...#10 - The Trap
Season 1 Episode 20 - Aired 4/28/2015
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
Writer: Alison Schapker, Brooke Roberts
8.1/1045 votesLoading...#11 - Rogue Air
Season 1 Episode 22 - Aired 5/12/2015
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
Writer: Aaron Helbing, Todd Helbing
8.1/1016 votesLoading...#12 - Godspeed
Season 5 Episode 18 - Aired 4/16/2019
After discovering that Nora is working with Thawne, Barry and Iris disagree about how to handle their daughter in the wake of this shocking news. Team Flash isn't sure they can trust Nora, so they go through her journal to find out exactly how she came to work alongside their greatest nemesis.
Director: Danielle Panabaker
Writer: Judalina Neira, Kelly Wheeler
8.1/1014 votesLoading...#13 - The Speed of Thought
Season 7 Episode 2 - Aired 3/9/2021
When Barry suddenly gains the power of speed thinking, he attempts to use his new gift to save Iris. While Barry is thrilled with his new power, Cisco is hesitant to trust it. Meanwhile, Eva must face a shattering truth.
Director: Alexandra La Roche
Writer: Jonathan Butler, Gabriel Garza
8.0/1050 votesLoading...#14 - Flash vs. Arrow (I)
Season 1 Episode 8 - Aired 12/2/2014
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: N/A
8.0/1045 votesLoading...#15 - Who Is Harrison Wells?
Season 1 Episode 19 - Aired 4/21/2015
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
Writer: Ray Utarnachitt, Cortney Norris
8.0/1041 votesLoading...#16 - Enter Zoom
Season 2 Episode 6 - Aired 11/10/2015
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.
Director: J.J. Makaro
Writer: Brooke Roberts, Gabrielle Stanton
8.0/1040 votesLoading...#17 - Legends of Today (I)
Season 2 Episode 8 - Aired 12/1/2015
Vandal Savage arrives in Central City and sets his sights on Kendra Saunders. After Vandal attacks Kendra and Cisco, they turn to Barry for help. Realizing how dangerous Vandal is, Barry takes Kendra to Star City and asks Oliver and team to hide her until he can figure out how to stop Vandal. However, things quickly go from bad to worse when a man with wings AKA Hawkman shows up and flies off with Kendra. Meanwhile, Harrison develops a serum to make Barry run faster and asks Jay to test it out. The crossover continues on Arrow S04E08 Legends of Yesterday (II).
Director: Ralph Hemecker
Writer: N/A
8.0/1026 votesLoading...#18 - I Know Who You Are
Season 3 Episode 20 - Aired 5/2/2017
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.
Director: Hanelle M. Culpepper
Writer: Bronwen Clark, Joshua V. Gilbert
8.0/1022 votesLoading...#19 - Therefore I Am
Season 4 Episode 7 - Aired 11/21/2017
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.
Director: David McWhirter
Writer: Thomas Pound, Eric Wallace
8.0/1020 votesLoading...#20 - Think Fast
Season 4 Episode 22 - Aired 5/15/2018
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.
Director: Viet Nguyen
Writer: Sam Chalsen, Kristen Kim
8.0/105 votesLoading...#21 - A New World (2)
Season 9 Episode 11 - Aired 5/10/2023
Iris is alarmed by Barry's disappearance and Cecile assures her everything will be ok, but does she know that for certain? Team Flash is affected by a mysterious substance and Khione develops a better understanding of what she can and cannot control.
Director: Kayla Compton
Writer: N/A
7.9/1046 votesLoading...#22 - Tricksters
Season 1 Episode 17 - Aired 3/31/2015
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
7.9/1038 votesLoading...#23 - Welcome to Earth-2
Season 2 Episode 13 - Aired 2/9/2016
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.
Director: Millicent Shelton
Writer: Greg Berlanti, Andrew Kreisberg
7.9/1021 votesLoading...#24 - All's Wells That Ends Wells
Season 7 Episode 1 - Aired 3/2/2021
When an experiment to save Barry's speed backfires, Nash Wells searches for a way to save The Flash and comes up with a dangerous plan. Meanwhile, Iris makes a startling realization inside the Mirrorverse and Cecile faces off with Rosa Dillon.
Director: Geoff Wing Shotz
Writer: Lauren Certo, Sam Chalsen
7.9/108 votesLoading...#25 - Wednesday Ever After
Season 9 Episode 1 - Aired 2/8/2023
Barry creates a map book to guide him and Iris throughout their future in order to keep her safe, but the results are not what he expected, and instead, they relive the same day over and over again. Joe has a heart-to-heart with Cecile. A new big bad is introduced to Team Flash and friends and foes, old and new, begin to descend upon Central City.
Director: Vanessa Parise
Writer: N/A
The Best Episodes of The Flash
Every episode of The Flash ranked from best to worst. Let's dive into the Best Episodes of The Flash!
After being struck by lightning, CSI investigator Barry Allen awakens from a nine-month coma to discover he has been granted the gift of super...
Genres:DramaSci-Fi & Fantasy
Network:The CW
Best Episodes Summary
"What's Past Is Prologue" is the best rated episode of "The Flash". It scored 8.5/10 based on 21 votes. Directed by Tom Cavanagh and written by Todd Helbing, Lauren Certo, it aired on 12/4/2018. This episode scored 0.0 points higher than the second highest rated, "It's My Party and I'll Die If I Want To".