The Grim Adventures of Billy & Mandy

Puddle Jumping (4x18)

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When Billy jumps into a supernatural puddle (a Cosmic Sinkhole, according to Grim), it takes him to the home of Granny Applecheeks, who wants to bake him into a pie. It's up to Mandy and Grim to save him, if the puddle can take them to right place.