13 Monster HighSonic the Hedgehog:Haunted Chaos » by Raptor Slash
Sonic somehow enter the Monster High world, he and his friends must team up with the ghouls at Monster High to find the Chaos Emeralds before Eggman and Van Helscream use it to take over the world, this will be Sonic Clawsome Adventure.
K, English, Adventure & Friendship, chapters: 10, words: 19k+, favs: 15, follows: 11, updated: 7/9/2016 published: 2/8/2015
60 Mobians and Monsters » by the invader teen14
These are characters you would never expect to crossover.
K+, English, Humor, chapters: 52, words: 18k+, favs: 8, follows: 1, updated: 11/26/2014 published: 3/23/2014
1 Ghouls and Sonic play Minecraft by 5 seconds of summer fan
Frankie gathers her friends from Monster High and Mobius to play Minecraft! How will this turn out? Read to find out!
K+, English, Humor, words: 325, 7/22/2014, Sonic, Frankie S.
8 Sonic the hedgehog and Monster high conspiracy theory by the invader teen14
This theory may shock you.
K, English, words: 335, favs: 1, follows: 1, 5/1/2014
2 Frankie's weird dream by 5 seconds of summer fan
Frankie is having a weird dream! What's it about? Read to find out! I own nothing.
K, English, Humor, words: 616, favs: 1, follows: 1, 4/24/2014, Sonic, Frankie S., Clawdeen W.
5 The hedgehog of monsters by the invader teen14
The black arms are destroyed and now Shadow is falling to earth but lands in New Salem where he meets the monsters and that's only the beginning of a new adventure for the hedgehog (a one shot but it will lead to a bunch of STH/MH one shots)
K+, English, words: 1k+, favs: 2, follows: 3, 2/16/2014, Shadow, Frankie S.