She has light purple hair and a bright teal green dress. She is a slightly brighter pink than the other starfish seen in the series.
She appears in the episode "I'm with Stupid" when she and Marty decide to visit Patrick's house for Starfish Day. Patrick tells them he's a genius and SpongeBob is his moronic neighbor, just to impress them and they buy it.
Unfortunately, Patrick starts milking the moment and starts mistreating SpongeBob. SpongeBob decides to tell the truth, but Janet and Marty still think Patrick's smart (being stupid, themselves) and laugh at SpongeBob. SpongeBob screams at the top of his voice and runs out of the house.
When Janet and Marty reveal their true names, Patrick realizes that they're not his parents and decides to interrogate them, but before he can, Squidward arrives with another starfish couple and Patrick realizes that they're his real parents. Marty and Janet remember they don't have a son and leave.