The Dumb Rock is a character who appeared in the episode "Dad's Dungeon." It guards the entrance of Joshua's dungeon by lying on it. It seems to be mindless, or just acts that way for some reason.


It is gray and is about half the size of Finn. It appears to be cross-eyed, and has a floppy, lolling tongue with widely spaced teeth. 


Dumb Rocks are recurring enemies in Adventure Time: Hey Ice King! Why'd you steal our garbage?!!


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