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Ninja Turtles and Ben 10 Crossovers
6 Ben 10: Mutant Omniverse: The Complete 1st Season » by Sonic Thunder Saiyan Turtle In a re-telling of Omniverse, Ben not only gains Rook as a partner, but a certain quartet of pizza-eating ninjutsu-taught mutant reptiles. (Reversioning coming soon, in conjunction with Rougarou144)
T, English, Adventure & Friendship, chapters: 2, words: 4k+, favs: 12, follows: 14, updated: 12/31/2019 published: 10/8/2019
30 Alien VS Ninja » by TyrothDarkstorm There are new powers in New York that can tip the scales in any direction, originating beyond Earth. Have the mutants and the Foot found themselves new and powerful allies, or their greatest foes yet? COMPLETE!
T, English, Humor & Sci-Fi, chapters: 13, words: 32k+, favs: 26, follows: 25, updated: 6/4/2017 published: 12/17/2016, [Monalisa, Raphael] Ben T., Prof. Paradox
Tongue Tied by NixKat Casey is happy for his aunt but words fail him.
K, English, Family, words: 289, 5/18/2016, April O'Neil, Casey Jones, Leatherhead
Gala by NixKat Leatherhead meets an interesting woman at a gala.
K, English, Romance, words: 152, favs: 1, 2/7/2016, Leatherhead
How to greet an alligator by NixKat Casey's aunt comes over for his wedding preparations and meets someone new.
K+, English, Romance, words: 284, favs: 1, follows: 1, 1/30/2016, Casey Jones, Leatherhead
Latenight Gaming by NixKat Undertale seems like the perfect game for Leatherhead. This fic is an Devin lives AU for my Contact AU.
K+, English, Romance & Family, words: 337, favs: 2, follows: 1, 1/24/2016
5 Metamorphosis » by NixKat Not long after his trip to Bellwood, a certain vigilante is going through some changes and they may not be for the better. Things go from bad to worse when a certain government agent shows up. Crossover between Ben 10:AF/UA and TMNT. Warning: violence, gore, foul language, and body horror. Parings include: Gwevin (Gwen/Kevin), Benlie (Ben/Julie), and Capril (Casey/April).
T, English, Family & Sci-Fi, chapters: 5, words: 9k+, favs: 11, follows: 13, updated: 9/4/2013 published: 12/24/2012, Casey Jones, Kevin
15 The Cross-dimensional Adventures of Ben 10: Hero meets Ninja Turtles » by Man of cartoons After his adventures with the Teen Titans, Ben (again) is needed in another universe. Meanwhile, Leo searches for his captured brothers alone...that should be easy. Except his in one of the Shredder's high strong fortress with little chances of winning. With the Shredder and his goons after him, he will need a hero's help. THE BEN 10 CROSSOVER WITH TEEN TITANS IS COMPLETE.
T, English, Humor & Adventure, chapters: 2, words: 19k+, favs: 36, follows: 11, updated: 8/27/2013 published: 8/8/2013, Leonardo, Ben T.
7 Contact » by NixKat Feeling miserable after his energy induced rampage Kevin calls his favorite cousin over for a visit. But when Casey Jones is in town things won't be peaceful for the Osmosian, especially since a certain villain is sceaming. Rated T for language and violence. Crossover with Ben 10 AF/UA and TMNT. Pairings: Gwevin, Benlie, Capril (Casey/April)
T, English, Family & Friendship, chapters: 7, words: 17k+, favs: 20, follows: 13, updated: 12/21/2012 published: 5/6/2012, Casey Jones, Kevin
9 Teenage Mutant Ninja Turtles alien force » by S.Ganon Ch'rell has escaped from prision,returned to Earth and is now in Bellwood. In this mutant turtles/Ben 10 alien force crossover, Ben and the Turtles must join forces in order to defeat the Utrom Shredder once and for all.
K+, English, Humor & Adventure, chapters: 3, words: 3k+, favs: 10, follows: 4, updated: 3/22/2009 published: 12/11/2008
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