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Nightmare Fuel: The SpongeBob SquarePants Movie
Unlike the rest of the series, this movie is considerably a lot darker and has plenty of horror elements. There's Dennis, the seriously threatening thugs, the brainwashing bucket helmets, the skull infested area, the horrible looking monsters, the trench, the diver, and the climax involving drying up and turning into non-anthropomorphic animals in a gift shop. Worse than all of that, ALL HAIL PLANKTON!!!