Sandy has a twin brother named Randy. Her first appearance was in the third episode of season 1 "Tea at The Treedome." She and SpongeBob both love karate. Sandy is also interested in science just like Plankton is. As seen in numerous episodes, though Sandy is seen using science for good. Sandy is usually seen wearing a white suit where a helmet with a pink flower on it. When she is in her treedome, she is seen wearing a purple bra, a purple skirt, and green underwear underneath it.