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Kara's sick day by Chuck B
Kara wakes up not feeling well and calls in sick to work she also calls her Super Friend Barry Allen who races to help her. This is just a nice little one-shot I did a while back.
Crossover - Flash & Supergirl - Rated: K+ - English - Friendship - Chapters: 1 - Words: 447 - Favs: 1 - Published: 7/31 - Barry A./The Flash, Kara D./Supergirl - Complete
The Flash reunites with Jake and his crew by Laquan2022 reviews
Jake, Izzy, and Cubby return to Central City to reunite with Barry Allen, Iris west, Cisco ramon, Caitlin snow, and Joe. But this time Jake and Izzy's future daughter Carol accidentally arrives to Central city. And secretly she's working with Captain Hook in the future. But the group doesn't know that yet. But they will though soon enough.
Crossover - Flash & Jake and the Never Land Pirates - Rated: K - English - Adventure - Chapters: 4 - Words: 2,233 - Reviews: 4 - Updated: 7/30 - Published: 11/5/2021
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: 5 - Words: 3,645 - Reviews: 3 - Favs: 4 - Follows: 7 - Updated: 7/24 - Published: 5/19 - Barry A./The Flash, Eobard T./Impostor Harrison W./Reverse-Flash
The Flash: into the Buffyverse by Stand with Ward and Queen reviews
When Barry runs into the singularity, he ends up in the Buffyverse universe at the end of Chosen. Barry must now come to grips with his new reality as he battles threats both supernatural and impossible.
Crossover - Buffy: The Vampire Slayer & Flash - Rated: T - English - Fantasy/Sci-Fi - Chapters: 9 - Words: 13,855 - Reviews: 49 - Favs: 65 - Follows: 67 - Updated: 7/20 - Published: 1/5/2021 - Buffy S., Faith L., Barry A./The Flash
Flashpoint Mayhem by TrueHorror88 reviews
Another victory for the team, yet someone was unable to celebrate that and chose to make a world-shaking decision. Barry saved his mother from death, changing his past and his present, but it also affected others without him knowing. Seth and his family are just as affected, maybe more. The team faces newer threats, but they're not new to the Lethal Protector. They're threats.
Crossover - Flash & Venom - Rated: M - English - Adventure/Romance - Chapters: 15 - Words: 458,243 - Reviews: 82 - Favs: 100 - Follows: 109 - Updated: 7/18 - Published: 4/18/2021 - [Dr. Caitlin S., OC] Killer Frost
Arrogance leads to downfall by Aragorn II Elessar reviews
The Illuminati try to fight an intruder in their Universe, but due to their arrogance, it does not go well for them. One-shot.
Crossover - Flash & Avengers - Rated: T - English - Adventure/Sci-Fi - Chapters: 1 - Words: 1,380 - Reviews: 12 - Favs: 30 - Follows: 14 - Published: 7/11 - Eobard T./Impostor Harrison W./Reverse-Flash - Complete
Possibilities by LycoX reviews
A series of one shots and ideas centered in the Arrowverse. (Requests Open Again)
Crossover - Flash & Arrow - Rated: T - English - Humor/Adventure - Chapters: 302 - Words: 369,709 - Reviews: 757 - Favs: 182 - Follows: 147 - Updated: 7/7 - Published: 3/5/2015
DONDE SEA, CUANDO SEA (THE FLASH X LEGENDS OF TOMORROW WHITEFLASH) by KingMaster2526
Historia ambientada en el 3x19 de The Flash -lo que sea por una hermana- -SCARLET CANARY / WHITEFLASH- AU
Crossover - Flash & Legends of Tomorrow - Rated: T - Spanish - Hurt/Comfort/Family - Chapters: 4 - Words: 18,780 - Favs: 2 - Follows: 2 - Updated: 7/3 - Published: 2/26 - Barry A./The Flash, Cisco R., Sara Lance/White Canary, Ray Palmer/Atom
There's A Car In The Living Room by changingdestiny40
Barry and Patty find their peaceful afternoon with friends at the West home rudely interrupted by a car barreling into the living room courtesy of Allegra due to a driving lesson with Chester gone wrong.
Crossover - Flash & Legends of Tomorrow - Rated: K+ - English - Humor/Friendship - Chapters: 1 - Words: 1,963 - Favs: 6 - Follows: 2 - Published: 6/26 - Barry A./The Flash, Allegra G. - Complete
Karry Universe by CharmedMilliE- Karry Master reviews
In an alternate universe both Barry and Kara exist together. This is what happens when they meet in college and fall in love. Follow them, their family, and friends through life from college years to being superheroes and beyond. This is Karry Universe. Leading the Millma Verse.
Crossover - Flash & Supergirl - Rated: T - English - Romance - Chapters: 185 - Words: 1,028,039 - Reviews: 3294 - Favs: 1,550 - Follows: 1,359 - Updated: 6/19 - Published: 3/4/2016 - [Barry A./The Flash, Kara D./Supergirl]
Heroes of SHIELD : Season 2 by What If Universe reviews
The Agents of SHIELD have returned to their "normal" everyday lives after they helped save the universe from the Batman Who Laughs and brought their homes back from the collision. But now they need to live with the fact they've become part of a bigger multiverse. But they can't worry about that now, considering their world is filled with problems of their own now.
Crossover - Flash & Agents of S.H.I.E.L.D. - Rated: T - English - Supernatural/Adventure - Chapters: 5 - Words: 10,300 - Reviews: 3 - Favs: 9 - Follows: 10 - Updated: 6/18 - Published: 9/8/2021 - [Barry A./The Flash, Skye/Daisy J.] Dr. Caitlin S., J. Simmons
Future Foundation (BRANCH of F&SM) by What If Universe reviews
Time is like a river; cause enough ripples and you could change the tide. What if the Flash was never born, in turn never creating the Reverse Flash? What if one simple change altered the universe forever? Welcome to a reality that shows one simple change can alter the course of everything. Follow us, as we journey farther into the unknown, and ponder the question: "What if…?"
Crossover - Flash & Fantastic Four - Rated: T - English - Humor/Parody - Chapters: 26 - Words: 73,920 - Reviews: 14 - Favs: 34 - Follows: 35 - Updated: 6/18 - Published: 9/3/2021 - Franklin R., Invisible Woman/Susan S., Spider-Man/Peter P., Valeria R.
Alternate Events 4: Multiversal Clashes by Cer1992 reviews
The fourth installment of the "Alternate Events" series that begins one month after the heroes of the various universes defeated the enemy forces from Earth-X and Earth-64. It's only a matter of time before a new threat arises and not only brings everyone together once again, but leads to chaotic clashes across the Multiverse.
Crossover - Flash & Smallville - Rated: T - English - Adventure/Sci-Fi - Chapters: 12 - Words: 69,771 - Reviews: 78 - Favs: 22 - Follows: 24 - Updated: 6/17 - Published: 9/29/2021 - Barry A./The Flash, Clark K./Superman, Lex L., Conner K./Superboy - Complete
United we stand, divided we fall by Bl4ckHunter reviews
An attempt of Tony Stark and Bruce Banner at creating a peacekeeping program Ultron backfires, so the Avengers, Oliver Queen and Barry Allen have to stand together against Ultron, despite the struggles that threaten to divide the entire group as they also face new enemies and find new allies.
Crossover - Flash & Avengers - Rated: T - English - Adventure - Chapters: 9 - Words: 28,192 - Reviews: 42 - Favs: 14 - Follows: 9 - Updated: 6/11 - Published: 6/5 - Complete
The Beginning of the Age of Heroes by ArrowverseFan833 reviews
Oliver, Barry, Kara, Laurel, Sara, and Thea are all trapped on Lian after going on the Queen's Gambit to have a celebration. See how the team becomes the heroes that the world will need them to be in the future. (The group is all from Starling City. Kara is taken in by the Queens and Barry is taken in by the Lances.)
Crossover - Flash & Arrow - Rated: T - English - Romance/Adventure - Chapters: 32 - Words: 36,183 - Reviews: 24 - Favs: 58 - Follows: 49 - Updated: 6/9 - Published: 6/7/2021 - [Oliver Q./Arrow/Green Arrow, Black Canary/Earth-1 D. Laurel Lance] Barry A./The Flash, Sara L. - Complete
What's Up, My Meta? by LycoX
In which Freeland, and later Central, takes one man's negativity and turns it into a positive much to his dismay. (Part of the 'Hijinks' series)
Crossover - Flash & Black Lightning - Rated: T - English - Chapters: 1 - Words: 511 - Favs: 2 - Follows: 1 - Published: 6/7 - Complete
Stuck Worlds by hunter.guiles.9 reviews
So I liked the hero swap. I thought about what happened if this was the price Oliver had to pay. Forcing them back to being each other's heroes. (Any help to create this new world would be awesome , I explained in the fanfic) Basically the world of cannon CW in the second reality jump in Elseworlds.
Crossover - Flash & Arrow - Rated: K - English - Humor/Drama - Chapters: 2 - Words: 1,053 - Reviews: 1 - Updated: 6/5 - Published: 3/21/2019 - Barry A./The Flash, Oliver Q./Arrow/Green Arrow
Special Delivery: Take Two! by LycoX
In which Jay makes a delivery to Freeland and sticks around afterwards during the events of 4x05.
Crossover - Flash & Black Lightning - Rated: T - English - Family/Friendship - Chapters: 1 - Words: 730 - Favs: 2 - Follows: 2 - Published: 6/4 - Jay G./The Flash, Jefferson P., Anissa P., P. Gambit - Complete
How Oliver and Barry Confused and Entire Police Department by jujukittychick reviews
Oliver makes a visit to Central officially to pay a visit to the CCPD with the intention of making a financial contribution to improve their resources. Unofficially though? He just wants to see his favorite little speedster.
Crossover - Flash & Arrow - Rated: T - English - Humor - Chapters: 3 - Words: 3,364 - Reviews: 9 - Favs: 239 - Follows: 159 - Updated: 6/4 - Published: 1/16/2019
Flash in Avengers by Arrowverse And MCU Fan reviews
What will happen if Kara, Oliver and Barry arrived in MCU, what will happen between them and the Avengers. Could they unite as one, could they defeat the new threats that comes before them. 1st story of the "Two Worlds" series. Cover made by Karry-Verse.
Crossover - Flash & Avengers - Rated: T - English - Adventure/Sci-Fi - Chapters: 19 - Words: 22,112 - Reviews: 70 - Favs: 42 - Follows: 44 - Updated: 6/2 - Published: 12/19/2021 - [Barry A./The Flash, Wanda M./Scarlet Witch] Captain America/Steve R., Iron Man/Tony S.
Godspeed No More: Take Two! by LycoX reviews
In which Godspeed gets taken out in an entirely different way during the events of 7x18.
Crossover - Flash & Supergirl - Rated: T - English - Drama/Sci-Fi - Chapters: 1 - Words: 915 - Reviews: 2 - Favs: 5 - Follows: 3 - Published: 5/30 - Barry A./The Flash, J'onn J./Martian Manhunter - Complete
The Bad Guys: Good to be Bad by Flash XS guy reviews
What if instead of saving an old lady, Mr. Wolf meets a baby that makes him want to go good. Never have there been 5 friends as infamous as The Bad Guys: Mr. Wolf, Mr. Snake, Mrs. Tarantula, Mr. Shark, and Mr. Piranha. When they get caught, they make a deal to be good to avoid prison, but can they be good for the baby?
Crossover - Bad Guys & Flash - Rated: T - English - Crime/Friendship - Chapters: 26 - Words: 57,583 - Reviews: 2 - Favs: 7 - Follows: 1 - Updated: 5/25 - Published: 5/24 - Mr. Wolf, Mr. Snake, Mr. Piranha, Mr. Shark - Complete
Captain Jake loses the mighty Battle by Laquan2022 reviews
this is a continuation of season 3 of Captain Jake and the Neverland pirates The Never Sea Conquest With a twist! that's right and the twist is that the Flash is in it, also his friends. Like Cisco Ramon Caitlin snow Iris West, and Joe West.
Crossover - Jake and the Never Land Pirates & Flash - Rated: K - English - Adventure - Chapters: 10 - Words: 3,816 - Reviews: 9 - Updated: 5/24 - Published: 6/11/2019 - Barry A./The Flash, Iris W., Jake, Izzy - Complete
New Justice- Memories of the League by CharmedMilliE- Karry Master reviews
When a magical villain escapes Alcatraz, Rae starts to have mysterious flashbacks and fears. When a 5th dimensional imp comes to help Nora Darkh and Kara have to go into Rae's mind.
Crossover - Flash & Supergirl - Rated: T - English - Chapters: 1 - Words: 10,991 - Reviews: 2 - Favs: 3 - Published: 5/23 - [Kara D./Supergirl, OC] Clark K./Superman - Complete
Water and Lightning by Ethere Mystique
Recently in Central City, a particle accelerator exploded, unleashing a wave of dark matter and unlocking powers in certain people. The Flash races to contain the new criminals cropping up. For years I've been living in the city, hiding my powers and my true self from my friends. But how can I continue to hide when I've got the power to do something, to help?
Crossover - Flash & H2O: Just Add Water - Rated: T - English - Adventure/Drama - Chapters: 2 - Words: 2,987 - Favs: 1 - Updated: 5/22 - Published: 5/8 - Barry A./The Flash, Eobard T./Impostor Harrison W./Reverse-Flash, OC
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