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Flash and Arrow Crossovers
508 Possibilities » by LycoX A series of one shots and ideas centered in the Arrow/Flash world. (Currently not accepting any idea requests)
T, English, Humor & Adventure, chapters: 183, words: 278k+, favs: 130, follows: 112, updated: 20h published: 3/5/2015, Barry A./The Flash, Oliver Q./Arrow/Green Arrow, Tommy M., John D./Spartan
95 League of two Earths: new world » by athenaFlashLightning When Earth-1 and Earth-38 merge into one, teams Flash, Arrow, Supergirl and Legends must unite. As new threats rise and old ones return, can the heroes stop those that threaten to destroy the whole Multiverse?
T, English, Adventure & Friendship, chapters: 45, words: 207k+, favs: 110, follows: 115, updated: 10/15 published: 3/9/2017, Barry A./The Flash, Dr. Caitlin S., Cisco R., Oliver Q./Arrow/Green Arrow
Barry Allen's Secret Sister » by Trelhu Barry Allen loves his sister. He doesn't want her involved in all this Flash business. How will she react when she finds out her beloved older brother is the hero of her city? Read on to know the story of Bella Allen, Barry Allen's secret sister.
T, English, chapters: 15, words: 19k+, favs: 3, follows: 3, 10/11, Barry A./The Flash, OC
Ice meets Fire by Mrs.Specter-Mikaelson-Reid Barry comes out to Joe and Iris. A person from Barry's past will support him and help him. Oliver can not believe he has feelings for his best friend and Leonard Snart will learn that he can not freeze everything.
K, English, Romance & Humor, words: 616, follows: 3, 10/7, [Barry A./The Flash, Oliver Q./The Arrow] OC, Leonard S./Captain Cold
6 Tales of Earth-X » by Writer207 Earth-X, the Earth so horrible it has no number. Citizens, resembling the inhabitants of Earth-1 and Earth-38, live under the strict regime of the New Reich, inspiring patriots and rebels alike. Sometimes they resemble their other-Earthly counterparts, but more often than not they are very different and are living different lives. (T because Earth-X)
T, English, Tragedy & Hurt/Comfort, chapters: 6, words: 14k+, favs: 6, follows: 5, updated: 10/7 published: 8/8
92 To Hell and Back » by Nyame 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)
T, English, Adventure & Friendship, chapters: 52, words: 152k+, favs: 275, follows: 266, updated: 10/6 published: 12/17/2017, Barry A./The Flash, Oliver Q./Arrow/Green Arrow, Slade W./Deathstroke
54 Scarlet Angel » by DC-MarvelGirl 1997 After the aftermath of the singularity that nearly destroyed the entire city, Alicia Galloway never thought that on top of her grief for what had happened, that she'd be fighting Zoom and another unexpected enemy, and discovering a full multiverse of infinite Earths. Sequel to Flash and Angel.
T, English, Supernatural & Romance, chapters: 25, words: 80k+, favs: 15, follows: 15, updated: 10/3 published: 10/29/2017, [Barry A./The Flash, OC] Iris W., Oliver Q./Arrow/Green Arrow
216 Unjustifiable » by CarVie16 New threats rise. Old threats return. A war is brewing, threatening to plunge the world into darkness. Team Flash, Team Arrow, the Legends, and Supergirl must unite to prevent the storm that comes their way. However, they must first each conquer their own obstacles in order to face the challenges ahead. (Based on Arrow S6, Flash S4, Supergirl S3, and Legends of Tomorrow S3)
T, English, Drama & Romance, chapters: 37, words: 204k+, favs: 74, follows: 63, updated: 10/3 published: 12/29/2017, Barry A./The Flash, Dr. Caitlin S., Oliver Q./Arrow/Green Arrow, Black Siren/Earth-2 D. Laurel Lance
71 Jonas Dearden Investigations » by LycoX After a premonition of a dark future the night before his return to Lian Yu from Russia disturbs his sleep, Oliver Queen sets out to discover if a key element of the vision is true. Upon learning it is, he vows to never again pick up the bow, instead opening a P.I. firm in Central City where he hires on newly-minted CSI, Barry Allen, and newcomer to Central City, Kara Danvers.
T, English, Friendship & Adventure, chapters: 35, words: 58k+, favs: 85, follows: 93, updated: 10/2 published: 1/15, Barry A./The Flash, Oliver Q./Arrow/Green Arrow
7 Coming Home » by melicitysmoak Ten days ago, Oliver's team of elite marines had been dispatched on a mission in the rebel-infested mountains of Kasnia. Felicity learned that though the mission was successful, Oliver was among the injured, and she has been worried sick about her boyfriend since. Little did she know, Oliver and her friends have planned the surprise of her life in so short a time. [Olicity AU]
K+, English, Romance & Drama, chapters: 3, words: 8k+, favs: 9, follows: 9, updated: 9/26 published: 8/27, Barry A./The Flash, Iris W., Oliver Q./Arrow/Green Arrow, Felicity S./Overwatch
The Flash: April Fools day by Tipofan4life It's April Fools day in Central City, and it's Cisco's favorite holiday but not everyone enjoys the pranks he pulls. After Harry (earth-2 doppelganger) gets pranked for the last time, he and Barry come up with a way to get back at Cisco to get him to stop the annoying pranks. Will Harry also learn to lighten up and mend his friendship with Cisco? Read and find out!
K+, English, Humor & Friendship, words: 1k+, follows: 1, 9/23, Barry A./The Flash, Cisco R., Harrison Wells, Oliver Q./Arrow/Green Arrow
1 Girls of a Feather by Write-To-You Felicity almost got married, but then broke up with Oliver. Caitlin lost Ronnie (twice!), and then Jay. Iris's kiss with Barry at the end of season 2 never happened. They are all in need of a serious girl talk. (posted for my 2 Year Anniversary on !)
K, English, Romance & Humor, words: 1k+, favs: 4, follows: 1, 9/19, Iris W., Dr. Caitlin S., Felicity S./Overwatch
85 Justice League Initiative » by Stand with Ward and Queen Based on LOT and The Avengers movie. Vandal Savage has traveled back in time with a plan to end the human race. The Time Council have charged Rip Hunter with assembling the world's greatest heroes in an attempt to stop him. But this team has issues, lots of issues. Can they come together to stop Savage or are we doomed?
T, English, Sci-Fi & Adventure, chapters: 12, words: 21k+, favs: 65, follows: 62, updated: 9/18 published: 6/16/2016, Barry A./The Flash, Oliver Q./Arrow/Green Arrow, Sara L.
6 Crisis on Earth-X: Bride's Pride Before the Fall by Bl4ckHunter Iris and Felicity trying to save the day in the crossover? Here's a more realistic outcome. Not for fans of Iris or Felicity
T, English, Tragedy, words: 665, favs: 9, follows: 8, 9/13, Iris W., Eobard T./Impostor Harrison W./Reverse-Flash, Felicity S./Overwatch
Estamos juntos » by DoppelGangerSeven Cada uno de sus familiares y amigos reaccionará distinto a su unión, algunos mejor y otros peor.
K, Spanish, Romance, chapters: 4, words: 1k+, favs: 1, follows: 1, updated: 9/12 published: 8/29, Barry A./The Flash, Oliver Q./Arrow/Green Arrow
2 Resurrection » by Noctowl101 An Au where Prometheus kidnaps Barry and Kara. They are the only ones to survive the explosion. Afterward they have to comfort a grieving Oliver. That is when two old friends show up and say they can help Oliver get his friends back.
T, English, chapters: 2, words: 1k+, favs: 2, follows: 4, updated: 9/9 published: 9/3
15 Perdiendo el hábito » by PruePhantomhive Iris desapareció tras ir a Ciudad Star a investigar una nota. Para encontrarla, Barry terminó pidiendo la ayuda del alcalde Queen.
T, Spanish, Drama & Romance, chapters: 8, words: 30k+, favs: 17, follows: 14, updated: 9/2 published: 12/28/2017, [Oliver Q./The Arrow, Barry A./The Flash]
Difficulty sleeping by Arwena1900 Oliver still has nightmares. Luckily, Barry is there for him.
K, English, Hurt/Comfort, words: 432, favs: 1, 9/2
8 The Effects of Flashpoint and the Return of Laurel Lance » by YarrTheWriter What if Flashpoint had way more timeline ramifications, mainly major? Including Laurel being brought back to life, and becoming a part of Team Flash. First part is Barry dealing with telling everyone about the changes to the timeline, then the rest of the chapters are normal life living with those changes. (Multiple Supergirl, and 2 Arrow Crossovers included)
K, English, Drama & Romance, chapters: 8, words: 8k+, favs: 7, follows: 4, updated: 8/31 published: 8/28, [Barry A./The Flash, Black Canary/Earth-1 D. Laurel Lance] Savitar, Thea Q.
55 United we stand » by Stand with Ward and Queen Sequel to Sara's aberration. Seven months after Adrian Chase failed in his mission to destroy Oliver, various members of the community gather for Barry and Iris' wedding. However, what should be a joyous occasion is interrupted by invaders from another earth. As the heroes fight to save their earth and friends, Barry is unsure about what he really wants.
T, English, Sci-Fi & Adventure, chapters: 17, words: 36k+, favs: 47, follows: 35, updated: 8/17 published: 6/26, Barry A./The Flash, Iris W., Dr. Caitlin S., Oliver Q./Arrow/Green Arrow
I Am Truly Lost (If He Can't See The Best In Me) by Ballycastle-Bat AU: Oliver and Barry report to Earth Thirty-Eight to assist Kara in taking down a particularly nasty foe. Oliver learns that everything hasn't been taken from him, he still has just one fear. Barry Allen.
T, English, Hurt/Comfort, words: 964, favs: 1, 8/16, Barry A./The Flash, Oliver Q./The Arrow, Barry A., Oliver Q./Arrow/Green Arrow
1 Una tarde by DoppelGangerSeven Se había declarado a su socio y nada había salido como lo esperaba.
K, Spanish, Romance & Angst, words: 537, 8/10, Barry A./The Flash, Oliver Q./Arrow/Green Arrow
1 Michaela and the Sorceress » by Scarlet Fitzwalter There's a new vigilante hero in Central City, a black clothed woman called the Sorceress, with a mysterious past. Mysterious, that is, until she meets a young girl named Michaela. After saving the vigilante's life, Michaela asks to aide the Sorceress in her work. With this, Michaela discovers adventure like she has never seen before and a tale filled with heroism and heartbreak.
T, English, Adventure & Sci-Fi, chapters: 2, words: 7k+, updated: 8/8 published: 8/5, Barry A./The Flash, Iris W., Det. Joe W., Wally W.
2 Detenido en el tiempo » by DoppelGangerSeven Cuando el tiempo le da una oportunidad a Barry
K, Spanish, chapters: 3, words: 2k+, favs: 1, follows: 1, updated: 8/6 published: 12/31/2017, Barry A./The Flash, Oliver Q./Arrow/Green Arrow
Lo que no ven by DoppelGangerSeven Sara Lance no entendía cómo todos soportaban esa situación y no hacían algo, tal vez era hora de cambiar las cosas.
K, Spanish, Romance, words: 406, favs: 1, 8/5, Barry A./The Flash, Oliver Q./Arrow/Green Arrow
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