Best crossovers
This is a collection of awesome crossovers that do a great job of fitting two fandom universes together. Completed or regularly updated stories of 30,000 words or more preferred. No fandom fusions (The Avengers are all Hogwarts students, for example); characters and settings should remain themselves until they encounter people or places from another fandom. Please invite more stories to the collection!
(Open, Moderated)
Recent works
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Up in the Sky! by Camsonius
Fandoms: The Avengers (Marvel Movies), Superman - All Media Types, Marvel Cinematic Universe, Agents of S.H.I.E.L.D. (TV), Marvel (Comics), DCU (Comics), DC Elseworlds, DCU
28 Nov 2023
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Summary
Clark Kent was just your average guy named after the most famous superhero ever created. Then he has a...more than average day. Clark suddenly finds himself dropped into a world he'd only seen on screen.
Fictional characters come to life when a god-like being from another reality decides Average Joe Clark Kent is just what he needs to fix the future of his world. Clark will have to discover what kind of a man he wants to be in this brave, new world.
Are heroes made or born? Maybe its a little bit of both. Clark has the powers and knowledge to fight for Truth, Justice and a Better Tomorrow. But will he be able to handle what it takes to make a difference?
Let's explore a version of the MCU where a strange visitor from another world comes with powers and abilities far beyond those of mortal men.
But he won't be coming alone...
Series
- Part 1 of Strange Visitor
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two roads diverged (and that has made all the difference) by RoseyPoseyPie
Fandoms: Buffy the Vampire Slayer (TV), Angel: the Series
13 Feb 2022
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Summary
“I know how we can defeat Glory!” Anya pronounced. Willow and Xander both looked up at her in surprise. Even Giles, over by the register with his tea, looked up in interest. “We run away!”
Thanks to some research done by Anya, the escape in Spiral is to a different dimension, where hopefully they should be safe from Glory’s all-powerful grasp until the window for the apocalypse passes. But trying to get home will be another matter altogether, in a world where humans are slaves, vampires undergo peculiar transformations, and Cordelia Chase is the messiah. Reuniting with old friends doesn’t guarantee things will get any easier, especially if their enemies also team up to maintain the status quo. What does it mean to be The Key? How many regimes will Buffy overthrow? Is there no place like home?
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On Punching Gods and Absentee Dads by Enigmaris
Fandoms: Harry Potter - J. K. Rowling, Marvel Cinematic Universe, Thor (Movies), The Avengers (Marvel Movies)
15 Apr 2020
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Summary
Harry finds out that his dad is alive, has been the whole time. Instead of being overjoyed, Harry's disgusted. His dad left earth and abandoned his friends. Every painful thing he's ever gone through can be traced back to one man. Now Harry's got super strength he can't control and an almost unnecessary amount of magical power. His dad might be living it up with the Avengers now but not for long. With the help of his friends, Harry comes up with a plan for revenge. Get ready Avengers, Harry's out to punch a god.
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Of Wolves and Witchcraft by Rhydeble
Fandoms: Parahumans Series - Wildbow, The Dresden Files - Jim Butcher
12 Apr 2020
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Summary
Harry Blackstone Copperfield Dresden is a Wizard and a Parahuman, pretending to be a Wizard that's pretending to be a parahuman. While investigating a case involving shapeshifting murderwolves, he meets a young bug-controlling refugee from Brockton Bay, a witness to the case. Together, they set out a trap for their enemies, and uncover their plans.
Part 1 of Of Wasps and Wizards
Series
- Part 1 of Of Wasps and Wizards
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Heroes Assemble! by Stargon
Fandoms: Harry Potter - J. K. Rowling, Marvel Cinematic Universe, Marvel
05 Feb 2020
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Summary
After five years travelling the world, Harry Potter has landed in New York. He figures that there's no better place than the city that never sleeps to settle in and forge a new life. If only the heroes, villains, aliens and spies had received the message. Begins just before the Avengers movie and continues through the MCU. Expect a long story with some extra faces along the way.
Series
- Part 1 of Heroes Assemble!
Recent bookmarks
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Summary
When an unbalanced girl with a penchant for dangling off high places suddenly 'poofs' into existence in a bar with no explanation, Harry has a new job. Just not one he ever would have wanted.
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Impetus by Crunchysunrises
Fandoms: _Buffy_the_Vampire_Slayer/The_Hunger_Games, Buffy the Vampire Slayer, The Hunger Games (Movies), Hunger Games Trilogy - Suzanne Collins, Hunger Games Series - All Media Types
05 Jun 2017
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For one ethereal moment, Haymitch thought that his tribute might finally kill someone, maybe everyone. Then he remembered who he was dealing with. (Buffy had already decided: she was going to burn this place to the ground.)
- Language:
- English
- Words:
- 58,191
- Chapters:
- 7/?
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- 3
- Comments:
- 1,714
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- 4,914
- Bookmarks:
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Bookmarked by rfresa
05 Feb 2025
Bookmarker's Collections:
Bookmarker's Notes
Had to add this story to my Best Crossovers collection even though it's unfinished. It just makes such a perfect blend of the two fandoms!
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"...the briefing room door opened, admitting an old man with pure white hair that fell half-way down his slightly-stooped back and a beard that came down to his waist and clutched a tall wooden walking stick, which was topped with a light purple glass ball... "Daniel, I thought you said he was an expert on Medieval Europe, not an expert from Medieval Europe," Jack muttered."
Starts somewhere in the beginning of season 7 of SG1. Not cannon-compliant with second half of Merlin season 5.
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a wolf age ere the world falls by wnnbdarklord for OnceVanzettiNotAnymore
Fandoms: The Avengers (Marvel Movies), A Song of Ice and Fire - George R. R. Martin
13 Oct 2017
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The boy in the weirwood dreams of another world, where heroes exist that can help save them all. He reaches through and pulls. Blue light fills him as the universe tears apart. The world changes.
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An MCU/ASoIaF crossover where the Avengers are pulled into Westeros to help with their White Walker problem. Except they get overshot and get sent farther back than intended. What else is Tony Stark going to do but build his way out?
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All Your Base Are Belong to Her by DreamSmithAJK
Fandoms: Buffy the Vampire Slayer, Stargate SG-1
27 Oct 2016
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Summary
Dawn has fallen between universes, and landed in a world not quite her own. Hunted by both SG:1 and the NID, she finds herself linked to what the people here call a 'StarGate', and unlocks new powers that might be the Key to her survival.