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This is a list of all the monsters in SpongeBob SquarePants.
The Trench Monsters appear 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 appear in "A Life in a Day" when Patrick attempted to jump over them on a skateboard, tied to his back.
Mr. Seaweed Monster Man
Butterfly (formerly dubbed Wormy by Sandy) seemingly terrorized Bikini Bottom because everyone thought he was a monster.
Krabby Patty (character)
The Krabby Patty scared SpongeBob as the latter hallucinated it being everywhere. It is revealed in a dream of SpongeBob's that the giant Krabby Patty is actually friendly and gives him a giant cookie and chocolate milk. It only appears in "Fear of a Krabby Patty."
The Money Dragon is a 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.
The Appetizer makes a brief appearance in "Squilliam Returns," where, probably a cooking failure, has caused the Appetizer to appear.
The Appetizer is a brown sloppy monster with one eye. The creature has a foot, plants, a shell, and a pair of fly wings.
The Yeti Krab is tall, light red, and has white hair on his legs, eye stalks, forearms, and an upper body. He has large light yellow teeth, light green eyes, and a bad temper. He also has an oddly shaped nose. He only appears in the episode "Yeti Krabs."
Lab Squidward is a monster made in a laboratory by Patrick and SpongeBob, in an attempt to create a temporary Squidward so as not to disrupt the real Squidward's sleep. This has however backfired when he smashed through the wall and destroyed part of the city. It only appears in the episode "Snooze You Lose."
Krabby Patty Creatures
Giant Golden Eel
The Giant Golden Eel is an giant eel that SpongeBob and Mr. Krabs were forced to face to get the golden coin within it’s throat by Madame Hagfish to lift the curse off the Krusty Krab. It only appears in "The Curse of the Hex."
Globulous Maximus is a humongous living booger leading the Morphoid invasion and the main antagonist in Globs of Doom.