 Another close friend of SpongeBob is Sandy Cheeks, a squirrel from Texas. She is a scientist and an expert in karate. She lives in an underwater tree dome (a tree Sandy brought with her that is entrapped in a clear glass dome locked by a tight, hand-turned seal). When outside of her dwelling, she wears an astronaut-like suit because she cannot breathe underwater. Mr. Krabs, a miserly crab obsessed with money, is the owner of the Krusty Krab restaurant and SpongeBob's boss. His rival, Plankton, is a small green copepod who owns a low-rank fast-food restaurant called the Chum Bucket, located across the street from the Krusty Krab. Plankton spends most of his time planning to steal the secret recipe for Mr. Krabs' popular Krabby Patty burgers, so as to gain the upper hand and put the Krusty Krab out of business.
