Spike had a Weird dream of falling into a pedestal that a voice offered him weapons to choose from to test his fate only to realize that he was consumed in darkness but turns out to be a nightmare he thought was real. Then a mysterious hooded man tries to see how Spike is this so called chosen one and decides to destroy his world Equistria only to be warped to a world where he is transformed into a human carrying a strange blade that will destroy darkness and save people's hearts and world's, now it's up to Spike to learn this blade's power to find his friends and explore the many world that await him.
Inspired by Kingdom Hearts all rights go to Square Enix
Also I'm not doing any Disney world's just video game, movie, and anime world's so if you want Spike to interact with them give me the idea that you have ( I'm not doing Bleach, One Piece, and Naruto too complicated)