The world of Adventure Time is already pretty dark for a kids' show - they've implied on multiple occasions that the Land of Ooo exists as it does due to a nuclear war bringing about an apocalypse, and there have been all kinds of dark and grim happenings. Still, that doesn't quite compare to the gritty reboot of the series from...GrittyReboots.

Welcome to an ACTUAL post-apocalyptic Land of Ooo - where magic is fading, people are dying, and Finn's sword is a lot less fanciful.