Karen Plankton

Karen Plankton (birthday: December 20) is one of the two main villains in the SpongeBob SquarePants franchise. She is a waterproof supercomputer who lives in the Chum Bucket laboratory. She is Sheldon Plankton's sidekick and wife who supplies him with evil plans to steal the Krabby Patty secret formula.

Karen's system is built into most of Plankton's inventions. She has two main forms: a big monitor on the wall of the Chum Bucket and a portable wheeled computer (sometimes with arms). Along with her role as co-owner of the Chum Bucket, she works as the busser, chef and cashier. She rarely has to fulfill these jobs due to the restaurant's unpopularity.

Karen was named after Karen Hillenburg, the wife of the show's creator Stephen Hillenburg. She is voiced by Jill Talley, who is married to SpongeBob's voice actor Tom Kenny. Both Karen and Plankton first appear in the episode "Plankton!"