the space multiversal time contynuum got broken, resulting in a lot of characters of a lot of universes be teleported in one place, but no it wasnt just because it broke randomly, zordon, the first ever mentor of a superhero team, did it, because a really powerful being, that no one knows its name or appearence, is going to attack the multiverse, the cartoons that are there are like naruto, miraculous, power rangers samurai, power rangers ninja storm, one punch man, bnha, and etc.