|First Appearance||"The Lost Mattress" May 13, 2005|
|Enemies||SpongeBob, Patrick, Squidward, Mr. Krabs|
A Guard Worm is a large, violent worm that guards various places in Bikini Bottom. They are a parody of guard dogs. This one was first seen in the episode The Lost Mattress, where it was living in the dump, at the moment on Mr. Krabs' misplaced money filled matrress, where Squidward was violently mauled by it various times. Another one was seen in the episode BlackJack when SpongeBob's cousin BlackJack had one guarding his front entrance. In Best Frenemies one was guarding the KelpShake store, on the night Krabs and Plankton tried to steal the KelpShake's formula. There are various Worms that work for the Bikini Bottom Police Force. In the episode Slide Whistle Stooges, three guard worms were supporting the police to go against Squidward, but then attacked on police officer when he called insulted them after they were going wild by the terrible whistle sound Squidward made. They are Green and have Silver spiked collars.
Nicktoons: Globs of DoomEdit
The Guard Worm appeared in the second stage of the Bikini Bottom level. You could enter a hidden area in the junkyard by breaking a wall. You then enter a hole where the Guard Worm is asleep near the mattress filled with money from the episode "The Lost Mattress".