>>150777744
Well anon, I'll give you run-down, I assume you watched the finale of Adventure Time.

>Simon is depresso that Betty's gone after years. Tries to summon her through a ritual
>Prismo is sad that Jake is dead, but years prior also placed the Fionna and Cake fanfic into a real universe inside Ice King's head
>When Ice King turned back into Simon, Fionna's magical world turned ordinary. Fionna's universe is literally inside Simon's head.
>Thanks to Simon's ritual is accidently caused things from Fionna's world, to go into Simon's world
>Prismo's universe creation is in violation of a universe law, and the whole series revolves around Simon, Fionna, and Cake trying to save Fionna's world from a literal interdimensional fed, by going through different universes to turn back into Ice King
>Ends with Fionna and Cake's world being half magical, and half modern.
>Simon isn't Ice King by the end, but learns a lesson in moving on - because Golb Betty literally prevents him from being Ice King.