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Published Jun 3, 2026, 10:41 PM EDT
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No, nobody thinks that The Flash is a perfect show. However, there are some phenomenal episodes within its long, 9-season run—some can even be considered masterpieces. While, for the most part, the show was only considered masterful in its first few seasons, there are still a couple Season 3 and onward episodes that are masterpieces.
Regardless of the season an episode originates from, these entries in The Flash saga are incredible in one way or another—or all of the ways, really—and are worth noting, even three years post-finale. The high-flying, fast-paced action and wonderful storytelling is nonstop... in these episodes, at least.
10 "I Know Who You Are"
Season 3, Episode 20
Image via The CWDespite the flak that Season 3 gets—especially the flak it got upon first release—it's far better than people give it credit for, especially in hindsight of the other seasons to come after. One of the best entries in Season 3 is, without a doubt, The Flash Season 3, Episode 20, "I Know Who You Are". This is primarily because of the stellar emotional drama within it between the likes of Team Flash and their ride-or-die friend-turned-enemy, Caitlyn Snow (Danielle Panabaker), now known as Killer Frost.
The kind of emotional drama found within this episode makes it so compelling from start to finish. By this point in the series, Caitlyn has become family to not just the rest of Team Flash, but the audience, as well. So, when she goes bad, it's genuinely heartbreaking, especially when both Barry and the viewer can see the good still within her. The real highlight of this episode, though, is none other than the gigantic reveal of Savitar's (Tobin Bell) identity... a temporal clone of Barry Allen (Grant Gustin) himself.
9 "Flash Back"
Season 2, Episode 17
Image via The CWTime travel has been important to the character of The Flash since the very beginning. This is true for the first season of the CW show, too. When Barry is dead-set on determining the secret to upping his speed via the methods of his nemesis, Eobard Thawne (Tom Cavanagh), aka The Reverse Flash. However, this causes some serious problems, not just for Barry, but for all of his friends in the past timeline.
When he goes back, the speedster accidentally gains the attention of a Time Wraith, protectors of the timeline that have a nasty, ghostly figure. Watching as Barry tries to blend in and be his last self, while Eobard slowly figures out who he really is, is so entertaining and genuinely adds to the tension of the episode.
8 "Rogue Air"
Season 1, Episode 22
Image via The CWPenultimate episodes can be pretty hit or miss on television, and, boy, did The Flash find a hitter in Season 1's, The Flash Season 1, Episode 22, "Rogue Air". Barry tries to save the meta humans they've imprisoned in the Particle Accelerator over the course of the season when Eobard Thawne—disguised as Harrison Wells—decides to turn it on again. However, as per usual, the plan doesn't go the way he hoped.
It's the finale of this episode that really causes it to stand out, though, as it's the big battle against Reverse Flash, who is facing not just Flash, but Arrow (Stephen Amell) and Firestorm (Robbie Amell), as well. This 3-v-1 fight is abundantly exciting and proves just how powerful Reverse Flash actually is, which adds to the stakes of the season finale to come.
7 "Enter Zoom"
Season 2, Episode 6
Image via The CWAside from Reverse Flash, none other than the terrifying Zoom (Tony Todd (Rest in Peace)) is by far the fan favorite villain of the series. His brutality, horrifying visage, deep voice—again, Rest in Peace, Tony Todd—and the fact that he is always a step ahead of the team, make him a force unlike any other that owns every scene he is in. No other episode shows this better than The Flash Season 2, Episode 6, "Enter Zoom," where Barry and the evil speedster have their first confrontation.
Zoom not only shows that he read straight through the team's plan from earlier in the episode, but he whoops Barry's butt so badly that he ends up breaking his back and parading his paralyzed body across the city. This episode features some of the best character writing for a villain in the entire show, and it's a huge reason that people fell in love with him so quickly.
6 "The Once and Future Flash"
Season 3, Episode 19
Image via The CWAnother absolute banger from Season 3 is The Flash Season 3, Episode 19, "The Once and Future Flash," which features Barry Allen heading not to the past this time, but to the future, in hopes of discovering how the team beats Savitar. When he gets there, though, he discovers a world unlike anything he could've imagined—one that ended in his worst nightmare: Iris West (Candice Patton), the love of his life, dying at the hands of the armored villain.
When he finds this dark future, he has to get his future self—a man completely broken and lost—to come back and help him out, reigniting hope back into his heart. Together, they team up to take on Mirror Master (Grey Damon) and The Top (Ashley Rickards), and it is such a fun moment, especially as fans get to see the cool costume that Future Flash has equipped. The story itself is a great commentary on what loss and grief can do to even the strongest of souls as they grow, and it genuinely can be very moving.
5 "The Trap"
Season 1, Episode 20
Image via The CWWhile all of Season 1 of The Flash is great, it's the latter half of the season that really kicks things into gear and features its most memorable episodes, especially when the truth behind Harrison Wells' true identity is revealed. This secret really begins to come to a head in The Flash Season 1, Episode 20, "The Trap", as the team tries to set a trap for Wells, using Cisco Ramon (Carlos Valdes) as bait.
The tension in this episode is beyond high, being nail-biting at every turn. By this point, audiences have already seen the brutality that Wells has and the very little issue he has with holding back. They watched as he murdered Cisco in the alternate timeline (before Barry changed the past), so using him as bait here is heart-pumping.
4 "Out of Time"
The Flash Season 1, Episode 15, "Out of Time" is, without a doubt, one of the most important episodes in the series and, therefore, one of the best, as well. This episode shakes up everything. Not only does this entry begin to use time travel as a plot mechanic, but it shakes things up in a big way, like the aforementioned death of Cisco at the hands of Wells.
All of the things that go wrong in this episode are undone by the time travel enacted by Barry when he reveals himself to Iris, and runs back and forth across the Central City shoreline to stop the oncoming tsunami. The best part about the discovery of time travel here is that it is completely by accident—helping it feel natural—and throws Barry into genuine conflict because of it. Therefore, this isn't treated as some deus ex machina for the problems in this episode, but it genuinely causes more in the coming stories.
3 "Enter Flashtime"
Season 4, Episode 15
Image via The CWYou know all those really cool super speed sequences in movies like X-Men: Days of Future Past and Sonic the Hedgehog? Well, The Flash took this episode—The Flash Season 4, Episode 15, "Enter Flashtime"—to flip the concept on its head and have some fun with it. Despite the whole time-stopping thing being fun in other movies, this entry in the show turns that into a living hell for Barry Allen.
When a bomb is mere moments from exploding, Flash enters what he calls "Flashtime" to figure out how to solve the scenario. However, he very soon discovers that being in this Flashtime state takes a gigantic physical toll on his body. This leads to a gripping, emotionally compelling plot that is engaging from minute one to the final second. Despite the quality beginning to decline by this point, this episode was proof that the show could still lock in and give viewers something amazing.
2 "The Man in the Yellow Suit"
Season 1, Episode 9
Image via The CWFor fans of The Flash, everything changed the night that The Flash Season 1, Episode 9, "The Man in the Yellow Suit" aired. Acting as the mid-season finale for the first season, this episode confirms what many theorized for quite a bit: Harrison Wells is the man who killed Barry Allen's mother, The Reverse Flash.
However, this comes after an incredible episode where this "Man in the Yellow Suit" makes his first appearance to Barry, and they have a battle on Christmas Eve. The entire episode is great, and begins to set up the show for the true endgame plot to come for the rest of the 14 episodes in the season remaining. The battle between them is one of the best fights in the series, especially when they have a true face-off at Central City Stadium.
1 "Fast Enough"
Season 1, Episode 23
Image via The CWThe Flash has always been pretty good with its season finales, but the best of them was the first one they pulled off, The Flash Season 1, Episode 23, "Fast Enough". The main conflict of the first season's final romp isn't one of "will Flash be faster than Reverse Flash" or "is Flash going to die?" No, the conflict here is a lot more complex: Eobard Thawne gives Barry the choice of a lifetime...
Barry can either stop Thawne from going home to the future and punish him for what he's done, or he can let the villain go and have the opportunity to go back in time and save his mother from the terrible fate that caused the events of the series in the first place. While initially choosing the latter, he's stopped by himself from the future and rather uses this chance to say a final goodbye to his mom before heading back to the past to thwart Thawne's unearned freedom.
Collider Exclusive · Marvel Personality Quiz Which MCU Hero Are You? Spider-Man · Daredevil · Iron Man · Punisher · Thor · Cap
Six heroes. One destiny. Answer 10 questions to discover which Marvel Cinematic Universe hero shares your personality, values, and fighting spirit. Will you swing, fly, or thunder your way to glory?
🕷️Spider-Man
😈Daredevil
🤖Iron Man
💀Punisher
⚡Thor
🛡️Cap
FIND YOUR HERO →
01
What drives you to do what's right? Choose the answer that feels most like you.
AWith great power comes great responsibility — I protect those who can't protect themselves. BMy faith and my conscience — I believe justice must be served, even in the dark. CLegacy and ego, honestly — but I've learned that others depend on me now. DThe system failed. Someone has to make sure the guilty actually pay. EDuty to the innocent and honour to my name — I was born to protect realms. FThe values I was raised with — freedom, decency, and never backing down from a bully.
NEXT QUESTION →
02
It's 2 AM. Where are you? Your answer says more about you than you'd think.
ASwinging between skyscrapers, keeping an eye on the neighbourhood. BRunning rooftops in Hell's Kitchen, listening for trouble. CIn my lab, upgrading my suit with a cold cup of coffee nearby. DStaking out a target I've been tracking for three weeks. ESomewhere between the stars, or at a feast that got out of hand. FOn a morning run — I was up at 4, actually. Couldn't sleep.
NEXT QUESTION →
03
How do you handle a villain who keeps escaping justice? Every hero has a method. What's yours?
AWeb them up and leave them for the police — again. BBuild an airtight case and dismantle their entire operation from the inside. CDeploy a containment system I designed specifically for them. Tech wins. DMake sure they don't escape a third time. Permanently. EChallenge them to single combat. Honour demands a decisive end. FRally allies, adapt the plan, and bring them in — by the book, even if it's hard.
NEXT QUESTION →
04
How do you feel about keeping a secret identity? The mask — or the lack of one — says everything.
AEssential — my loved ones would be in danger if anyone found out who I am. BCritical — the mask protects my mission as much as my face. COverrated — I announced myself to the world and I'd do it again. DI'm a ghost. The less people know about me, the better. EMy name is known across the Nine Realms. There's no hiding it. FI don't hide — but I understand why some need to. Transparency builds trust.
NEXT QUESTION →
05
You've lost someone important because of your heroism. How do you carry that? Every hero pays a price. The question is how they pay it.
AWith guilt that never fully goes away — it pushes me to do better, every single day. BI channel it into purpose — their memory is the reason I keep fighting. CI buried myself in work for years. I'm only recently learning to face it. DIt transformed me completely. I'm not the same person I was before. EWith warrior's grief — I honour them by fighting with everything I have. FI keep moving forward. Stopping means letting the loss win.
NEXT QUESTION →
06
What's your role when working with a team? Who you are under pressure is who you actually are.
AThe enthusiastic wildcard who somehow makes it work — and keeps the mood up. BThe strategist who works best alone but shows up when it matters most. CThe one who funds it, equips it, and occasionally takes over the whole operation. DI don't do teams. I'm more effective operating solo, on my terms. EThe heavy hitter — I crash in, draw fire, and turn the tide of battle. FThe leader — I earn trust, build the plan, and make sure no one gets left behind.
NEXT QUESTION →
07
Where do you draw the line between justice and revenge? The answer defines what kind of hero you really are.
AClearly — I don't kill, and I wrestle with that line constantly. BI try to hold the line, but I've come terrifyingly close to crossing it. CPractically — I do what's necessary to protect people, including hard calls. DI crossed that line long ago. What I do is justice — the system just won't admit it. EIn battle, victory is justice. Mercy is earned — not automatic. FFirmly. The moment we abandon our principles, we become what we fight against.
NEXT QUESTION →
08
When you're not saving the world, what does life look like? The person behind the mask is always the more interesting story.
ATrying to juggle school, a part-time job, and not failing my friends. BWorking as a lawyer by day, fighting for justice in court and on the streets. CRunning a global company, attending galas, and pretending I'm sleeping enough. DQuiet. Isolated. Surviving with a clear mission and no distractions. ENavigating a bizarre and fascinating mortal world — coffee is extraordinary. FAdapting to a world decades ahead of everything I knew. Quietly, stubbornly.
NEXT QUESTION →
09
What keeps you up at night? Fear is useful data — if you're honest about what you're actually afraid of.
AThe people I couldn't save — and the ones I might not reach in time tomorrow. BWhether the monster I fight every night is starting to live inside me too. CThe threats I can see coming and whether my tech is actually good enough. DNothing. Silence is the only peace I get. I've made my choices. EWhether I'm truly worthy — of the hammer, of the throne, of the people I protect. FA world where no one stands up anymore. Where good people do nothing.
NEXT QUESTION →
10
The battle is lost. You're outnumbered, outgunned, and exhausted. What do you do? This is your tiebreaker — choose carefully.
ACrack a joke to buy a second, then find the one web shot that changes everything. BBlock out everything except the sound of the next threat — and keep going. CActivate the emergency protocol I built for exactly this scenario. Always have a plan. DI don't accept that it's lost. I keep fighting until I physically cannot anymore. ECall the lightning. All of it. The storm answers to me. FPick up the shield. Stand up. Because as long as I can stand, it's not over.
REVEAL MY HERO →
Your Hero Has Been Identified Your MCU Hero Is…
Based on your answers, the Marvel hero who matches your spirit, values, and instincts has been revealed.
🕷️ Spider-Man
You carry the weight of the world on shoulders that are younger than they should have to be — funny, loyal, and endlessly self-sacrificing.
- You do the right thing not because it's easy, but because no one else will.
- You understand that responsibility isn't a burden you choose — it's one that finds you.
- Whether it's a neighbourhood mugging or a multiverse crisis, you show up.
- Peter Parker's lesson — that great power demands great responsibility — isn't a slogan to you. It's the code you live by, even when it costs you everything.
😈 Daredevil
You fight in the shadows between law and chaos, guided by a fierce moral compass that refuses to let the guilty walk free.
- You use every tool available — your mind, your body, your faith — to protect those the system overlooks.
- You've looked into the darkness and chosen not to become it, though the line has never been easy.
- Matt Murdock's duality — champion in the courtroom, devil in the alley — mirrors your own.
- Relentless, conflicted, and unwilling to stop. That is exactly you.
🤖 Iron Man
Brilliant, driven, and occasionally insufferable — but always the person who solves the unsolvable problem.
- You lead with your mind and back it up with resources, innovation, and a stubbornness that borders on heroic.
- You started out looking out for yourself, but somewhere along the way the world became your responsibility.
- Tony Stark's arc — from ego to sacrifice — is your arc too.
- You build, you plan, and when the moment comes, you're willing to give everything. Because in the end, you're Iron Man.
💀 The Punisher
You've been through fire that would break most people — and it did change you, completely. What's left is unyielding, relentless, and operating by a code forged in grief.
- You don't ask for forgiveness, and you don't expect gratitude.
- You see a corrupt, broken world and you've decided to do something about it, consequences be damned.
- Frank Castle's war is born from love twisted by loss — and so is yours.
- Uncompromising and unflinching — the world may not agree with your methods, but your conviction is absolute.
⚡ Thor
Powerful, proud, and on a lifelong journey to become worthy of the legend you carry.
- You lead with strength but have learned — sometimes painfully — that true greatness comes from humility and growth.
- You're larger than life, yet more vulnerable than you let on.
- Thor's story is one of transformation: from arrogant prince to worthy king, from isolated warrior to beloved protector.
- You bring the storm when it's needed — and the warmth when it matters just as much.
🛡️ Captain America
You believe in something bigger than yourself — and you fight for it even when the world has moved on and nobody else will.
- You don't bully the small guy, and you never stop when it gets hard.
- Steve Rogers didn't become a hero when he got the serum — he was always one. So were you.
- Your strength isn't in your fists; it's in your refusal to compromise what's right, no matter the cost.
- In a world full of people taking the easy road, you're the one who picks up the shield and stands up — every single time.
↻ RETAKE THE QUIZ
The Flash
Release Date 2014 - 2023-00-00
Network The CW
Showrunner Eric Wallace
English (US) ·