Karen Plankton is an ancestor of Sheldon J. Plankton and is the wife of the evil wizard Planktonamor.
She is a round shaped emerald crystal ball with Karen's lines in it. She makes a single appearance in the episode "Dunces and Dragons."
She has the personality of Karen Plankton the computer, and acts very similar.
Role in episode
She is seen to show Planktonamor the location of SpongeBob and Patrick and what they are doing on her screen.