Flash Crossovers
Filters
2K | Page 1 2 3 4 11 .. Last Next »

Beautiful by CharmedMilliE- Karry Master reviews
On a world where most of our favorite characters are actors they balance their jobs, fans, conventions, their real lives including kids, and superhero life.
Crossover - Flash & Supergirl - Rated: T - English - Family - Chapters: 25 - Words: 143,212 - Reviews: 128 - Favs: 50 - Follows: 42 - Updated: 2h - Published: 8/25/2019 - [Barry A./The Flash, Kara D./Supergirl] [Dr. Caitlin S., OC]
Something Else by Zuiri
Mick x Caitlin, following the events of "It Had to Be You." Multiple chapters. In an attempt to save the Legends from a mysterious group out to destroy them, Caitlin joins the team and begins a chaotic adventure through time.
Crossover - Flash & Legends of Tomorrow - Rated: M - English - Adventure/Romance - Chapters: 3 - Words: 19,130 - Favs: 1 - Follows: 2 - Updated: 9/15 - Published: 1/9
Heroes coming together by Aragorn II Elessar reviews
The Singularity at the end of Flash Season 1 has graver consequences than anyone foresaw. Now, it is up to Heroes from various worlds to come together and defeat the forces of evil that have risen in the Singularity's wake. LOTR/MCU/Star Wars/Buffyverse/Smallville/Supernatural/Arrowverse crossover. Part 1 of 'When Heroes meet'.
Crossover - Flash & Avengers - Rated: T - English - Adventure/Friendship - Chapters: 4 - Words: 23,464 - Reviews: 57 - Favs: 44 - Follows: 35 - Updated: 9/15 - Published: 8/27 - Barry A./The Flash, Cisco R., Captain America/Steve R., Thor
To Hell and Back by Nyame reviews
The AU where Oliver, Barry, and Kara survive Lian Yu together for years, raising a baby Kal-El, and are eventually rescued – by the League of Assassins. (Note: This version is unedited. For main, edited version, go to AO3)
Crossover - Flash & Arrow - Rated: T - English - Adventure/Friendship - Chapters: 165 - Words: 530,190 - Reviews: 457 - Favs: 796 - Follows: 702 - Updated: 9/15 - Published: 12/17/2017 - [Barry A./The Flash, Iris W.] [Oliver Q./Arrow/Green Arrow, Black Canary/Earth-1 D. Laurel Lance]
Kara & Barry: Sparks & Forces by KeaneDragon reviews
Barry & Kara hit off well when he was stranded on Earth 38. Now he's back on Earth 1 in a severe crisis. Kara is facing multiple crisis of her own. How will they spark again?
Crossover - Flash & Supergirl - Rated: K+ - English - Adventure/Romance - Chapters: 10 - Words: 20,361 - Reviews: 9 - Favs: 5 - Follows: 6 - Updated: 9/14 - Published: 7/22 - [Barry A./The Flash, Kara D./Supergirl]
Amalgamated Worlds: Sentinel's Sight by Sentinel of Stories
In order to avoid a cataclysm that might end the entirety of the omniverse, a lone Monitor takes some drastic measures which has severe repercussions on the worlds under his purview.
Crossover - Power Rangers & Flash - Rated: T - English - Sci-Fi - Chapters: 1 - Words: 3,591 - Favs: 2 - Follows: 2 - Published: 9/11 - OC - Complete
Accidental Meeting by UltraPhantom reviews
After accidental getting stuck in Kara's world, Barry was ready to go home. Unfortunately, the Multiverse had other plans as the fastest man alive ends up in the Originals World. There Barry must decide on what to do as well as to who to trust. But can Barry get home before he gets too rope into the Michaelson's battle? AM: 1
Crossover - Flash & Originals - Rated: T - English - Supernatural/Friendship - Chapters: 1 - Words: 2,902 - Reviews: 4 - Favs: 6 - Follows: 8 - Published: 9/10 - Barry A./The Flash, Klaus M., Elijah M., Rebekah M.
A Story of A Multiverse: Torn From My World by GrimesAllen08 reviews
Takes place after The Flash 2x23. In one reality, Barry created Flashpoint after the death of his father. In another, things took a drastic turn. Barry finds himself trapped in a completely different earth, ripped away from his loved ones and thrown into a constant battle for survival in a zombie apocalypse. Making friends and foes, old and new, can he survive? Or will he fail?
Crossover - Flash & Avengers - Rated: M - English - Sci-Fi/Angst - Chapters: 24 - Words: 81,388 - Reviews: 39 - Favs: 13 - Follows: 15 - Updated: 9/8 - Published: 4/8 - Barry A./The Flash, Black Widow/Natasha R., Captain America/Steve R., Iron Man/Tony S. - Complete
A Speedster in Sunnydale by fmfan1980 reviews
Barry wanted to change the past after the battle with Zoom. Instead of reaching his past, he finds himself stuck in a place of magic, demons, and vampires. A place that attracts the creatures of darkness, and is guarded by a peppy former cheerleader. (Undergoing rewrites.)
Crossover - Buffy: The Vampire Slayer & Flash - Rated: T - English - Chapters: 20 - Words: 98,386 - Reviews: 125 - Favs: 258 - Follows: 303 - Updated: 9/4 - Published: 7/29/2016 - [Buffy S., Barry A./The Flash]
Scarlet Spider & Speedster 3 : Flashpoint Paradox by What If Universe reviews
Barry Allen did it. He saved his mother, and ruptured all of time and space. Now the ripple effect has taken place and Ripples of distortion radiated from that point of impact, shifting everything just slightly, but enough to make gigantic impact on the timeline. Friends have become enemies, enemies will never come to pass, and let's just say the universe will never be the same.
Crossover - Spider-Man & Flash - Rated: K+ - English - Family/Angst - Chapters: 1 - Words: 3,431 - Reviews: 1 - Favs: 10 - Follows: 7 - Published: 9/2 - [Peter P./Spider-Man, Mary Jane W.] [Dr. Caitlin S., Barry A./The Flash]
Percy Jackson the Fastest Man Alive by WraithPlague049 reviews
Percy is betrayed and gains a incredible power.
Crossover - Percy Jackson and the Olympians & Flash - Rated: M - English - Adventure - Chapters: 2 - Words: 1,081 - Reviews: 1 - Favs: 2 - Follows: 3 - Published: 8/28 - Hunter Z./Zoom, Percy J.
From Heartbreak To A New Beginning by changingdestiny40 reviews
Following a shocking betrayal from his wife and the resulting violent aftermath, Barry is taken in by a concerned Patty and Felicity, two of his closest friends. And they help him heal and lead him towards new and unexpected love. Volume II.X of {MULTIVERSAL SAGA}
Crossover - Flash & Arrow - Rated: T - English - Hurt/Comfort/Romance - Chapters: 4 - Words: 10,166 - Reviews: 8 - Favs: 21 - Follows: 21 - Updated: 8/20 - Published: 12/11/2020 - [Barry A./The Flash, Patty S., Felicity S.] Oliver Q./Arrow/Green Arrow
The Hitchhiker's Guide to the Millma Verse by Captain Sigma- Karry Co-Master reviews
With so many worlds in the multiverse, Hitchhiking Kayla enlists Mutant Cisco to explore, finding potential friends and enemies along the way. Continuing story. Part of the Millma Verse.
Crossover - Flash & Supergirl - Rated: K - English - Adventure/Sci-Fi - Chapters: 25 - Words: 156,053 - Reviews: 112 - Favs: 32 - Follows: 22 - Updated: 8/19 - Published: 11/26/2019 - Barry A./The Flash, Cisco R., Kara D./Supergirl
Scarlet Spider & Speedster 2 : Crisis on Two Earths by What If Universe reviews
Opening a singularity and destroying a whole chunk of the city apparently wasn't bad enough. Now they have been left cleaning up their city, and it seems there's now a new threat out there. One that has already conquered one universe and is now coming for theirs. Now the family needs to come together once again to keep their world safe. Their fates are in their hands.
Crossover - Spider-Man & Flash - Rated: T - English - Drama/Family - Chapters: 24 - Words: 174,503 - Reviews: 26 - Favs: 36 - Follows: 36 - Updated: 8/19 - Published: 1/13 - [Mary Jane W., Peter P./Spider-Man] [Barry A./The Flash, Dr. Caitlin S.] - Complete
The PJ masks meet The Flash by Happy New Year 2022
In the town of Tarabiscoville, boy named Connor gets hit by the portable accelerator and becomes none other than catboy. but his journey had just begun. due to the death of his sister by none other than the reverse Cameron. Connor would have to leave his life in another town named Central City where another speech still lives named Barry Allen AKA The Flash.
Crossover - PJ Masks & Flash - Rated: K - English - Adventure - Chapters: 9 - Words: 12,489 - Favs: 1 - Follows: 1 - Updated: 8/18 - Published: 8/18/2022 - Barry A./The Flash
The Avenging Flash by G4dgetJunior reviews
In an alternate universe, Spiderman does not come into existence. Instead, a different hero rises to the call. The Flash! Steve x Natasha. Barry X Kara.
Crossover - Flash & Avengers - Rated: T - English - Sci-Fi/Adventure - Chapters: 4 - Words: 9,512 - Reviews: 2 - Favs: 16 - Follows: 18 - Updated: 8/9 - Published: 8/6 - Barry A./The Flash, Eobard T./Impostor Harrison W./Reverse-Flash, Black Widow/Natasha R., Iron Man/Tony S.
The Fundrasier by Little Bit Scandalous reviews
Barry Allen was trying to get his coffee on a really busy day when a group of four people he had never seen before mistook him for his twin. Something that hadn't happened since he was a teenager. Rachel Berry, Santana Lopez, Kurt Hummel, and Quinn Fabray were in Central City planning a fundraiser when they see someone they have not seen in about 8 years. *ON HIATUS WILL RETURN*
Crossover - Flash & Glee - Rated: K+ - English - Humor/Friendship - Chapters: 8 - Words: 24,033 - Reviews: 26 - Favs: 106 - Follows: 108 - Updated: 8/8 - Published: 8/7/2021 - Barry A./The Flash, Rachel B., Kurt H., Sebastian S.
Heroes Collide by UltraPhantom reviews
Barry, Oliver, Kara, and the rest of the heroes had just defeated the Dominator Invasion. They can finally rest...not. After the battle, the Dominators had one last trick that sent the Trinity into the MCU. They meet other heroes as they try their best to get them home. Along the way, the Trinity decided to help their world with their own threats. AMCU: 1
Crossover - Flash & Avengers - Rated: T - English - Adventure/Drama - Chapters: 7 - Words: 15,239 - Reviews: 47 - Favs: 62 - Follows: 75 - Updated: 8/8 - Published: 10/24/2021 - Barry A./The Flash, Oliver Q./The Arrow, Captain America/Steve R., Iron Man/Tony S.
Riding the Lightning! by Elyred3516 reviews
(NOT FOR WEST-ALLEN FANS) A series of our very own Scarlet Speedster going on a sexual hazardous rampage with countless woman across the multiverse (Barry multi)
Crossover - Flash & Supergirl - Rated: M - English - Romance/Humor - Chapters: 11 - Words: 72,938 - Reviews: 40 - Favs: 64 - Follows: 63 - Updated: 8/7 - Published: 1/28/2022 - [Barry A./The Flash, Kara D./Supergirl, Lena L.]
Marvels The Flash (Avengers 1) by G4dgetJunior reviews
What If A Certain Speedster Existed In the MCU? Could Certain Events Change? What Would Happen Differently? Eventual Barry X Natasha, Steve X Kara. Reviews Are Welcome.
Crossover - Flash & Avengers - Rated: T - English - Hurt/Comfort/Sci-Fi - Chapters: 7 - Words: 4,626 - Reviews: 13 - Favs: 37 - Follows: 35 - Updated: 8/7 - Published: 4/24/2022 - Barry A./The Flash, Cisco R., Captain America/Steve R., Erik S.
Flash Fiction by Toaofwriting reviews
Part II of the Lightning-Struck TARDIS series. A series of short pieces covering the plots, adventures, battles, and day-to-day lives of Barry's friends, allies, and enemies.
Crossover - Doctor Who & Flash - Rated: K+ - English - Adventure - Chapters: 7 - Words: 4,348 - Reviews: 3 - Favs: 6 - Follows: 8 - Updated: 8/7 - Published: 5/19/2022 - Barry A./The Flash, Eobard T./Impostor Harrison W./Reverse-Flash
Lawyering up by Aragorn II Elessar reviews
After his confession to the press, Thawne/Wells decides to lawyer up. One-shot. Post 1x11 of Flash.
Crossover - Angel & Flash - Rated: T - English - Sci-Fi/Supernatural - Chapters: 1 - Words: 409 - Reviews: 6 - Favs: 11 - Follows: 3 - Published: 8/2 - Lilah M., Eobard T./Impostor Harrison W./Reverse-Flash - Complete
Legends of Tomorrow: Golden Rogue by ElementalDrift reviews
This story is a version of Legends of Tomorrow, which includes: Lisa Snart. In cannon Lisa had left The Flash in season 2, but in this we will see what happens when she sticks with her brother and partner, and later joins the Legends.
Crossover - Flash & Legends of Tomorrow - Rated: T - English - Chapters: 6 - Words: 24,593 - Reviews: 1 - Favs: 2 - Follows: 3 - Updated: 8/1 - Published: 12/26/2022
Shinobi of the Multiverse by DigitallyAdmiringHumanity reviews
After the war the Biju decided to stay with Naruto, this caused some complications one of which is immortality. After a 5-year training trip, he comes home to find things aren't how he expected them to be. Sakura realized her feelings for Naruto, they get married and she becomes immortal. Later they decide that they aren't needed anymore and decide to travel the Multiverse
Crossover - Flash & Naruto - Rated: M - English - Family/Adventure - Chapters: 14 - Words: 111,009 - Reviews: 52 - Favs: 320 - Follows: 322 - Updated: 7/29 - Published: 5/13/2021 - [Sakura H., Naruto U.] Barry A./The Flash
A Shaman's Student by Mika the Supreme Ninja reviews
Trained by Esrin Fortuna in the arcane arts, Cord returns to his home at the behest of the spirits with one goal. Make it better at all costs, and gain greater power still. With skill and power, he finds the vigilante archer and quickly makes allies with him, healing his wounds and offering him a chance at greater successes. Together, nothing can stop their pursuits.
Arrow - Rated: M - English - Adventure/Supernatural - Chapters: 1 - Words: 510 - Reviews: 1 - Favs: 3 - Follows: 5 - Published: 7/15 - Oliver Q./Arrow/Green Arrow, Thea Q., OC
2K | Page 1 2 3 4 11 .. Last Next »