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Grandma's ghost is a character who appears in the episode "The Ghost of Plankton."
She is a light blue elderly fish ghost with long white hair. She wears a dress that is a darker shade of blue. Her face is very wrinkly and her pupils are red.
Role in episode
She appears in a horror movie that Plankton and Karen are watching. She is seen chasing her frightened granddaughter in the movie. She finally catches her and traps her in a mysterious ghostly force and Plankton yells out "Get her grandma!" She gives Plankton the idea to become a ghost to steal the Krabby Patty secret formula.