Patrick accidentally opened a toxic waste can which poured radioactive waste on a group of purple barnacles which caused them to fuse together to become a giant monster, but despite his scary appearance, he is quite friendly. Raarg's name originates from the only noise he makes. He is first discovered by Patrick when Patrick was playing with a snow globe, after which Patrick was covered in Raarg's slime. The two became friends upon finding out they had similar interests. Patrick and Raarg played ring toss, hide and seek, and smelled each other's armpits. Raarg roared after he was asked his name by SpongeBob, and SpongeBob, who also became friends with him, said "Nice to meet you Mr. Raarg." Raarg unintentionally destroys SpongeBob, Patrick, and Squidward's houses, bringing about the attention of the Bikini Bottom Police Department, who captured him. However, Raarg is frightened when a police officer sneezes into a megaphone. He escapes and starts rampaging through the city. Patrick tells the policemen that he is friends with Raarg, but he still run out of town. At the end of the episode, Raarg moves to a snowy mountain peak and helps SpongeBob by delivering ice cubes to the Krusty Krab. Patrick still visits him.
- Raarg was seen reading the Toxic Waste Monthly magazine which, of course, he is created from toxic waste.