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This is a list of all the monsters in the show SpongeBob SquarePants.
The Trench Monsters appeared in The SpongeBob SquarePants Movie, when SpongeBob and Patrick had to cross a trench. The Monsters turned out to be nice and sang "Now That We're Men" with them. They later appeared in "A Life in a Day" when Patrick attempted to jump them on a skateboard, tied to his back.
Mr. Seaweed Monster Man
Butterfly (formerly dubbed Wormy by Sandy) seemingly terrorized Bikini Bottom because everyone thinks he was a monster.
Giant Krabby Patty
The Giant Krabby Patty scared SpongeBob by seeing it everywhere. It turned out that the giant Krabby Patty is friendly and gives SpongeBob a Giant cookie and Chocolate Milk. It's only appearance to date was in "Fear of a Krabby Patty."
The Money Dragon is an creature that is only seen during Mr. Krabs' hallucination in the episode "Safe Deposit Krabs." It is known for "eating" Mrs. Greenback. Outside of the hallucination, the Money Dragon is just a vacuum cleaner.
Giant Krabby Patty
The Giant Krabby Patty is a massive, sentient patty with the side effects of Sandy's growth serum that appeared in "The Krabby Patty That Ate Bikini Bottom." It gradually grew and eventually ate Bikini Bottom. SpongeBob absorbed the patty, putting everything back in place.
Puffy Fluffy was one of many cute pets being sold by a woman in "A Pal for Gary." She warned SpongeBob upon buying it but he didn't listen. Puffy was small and cute at first but later turned into an aggressive monster, wrecking SpongeBob's house. Gary scared it off later.