Grand Dad Plankton
Physical appearance
Gender: Male
Color: Deep Green
Eye color: Light yellow with a red pupil
Classification: Plankton
Spouse: Ella Plankton
Children: Gordon Plankton
Silas Plankton
Grandchildren: Sheldon J. Plankton
Ancestors: Dead Eye Plankton
Karen the Crystal Ball
Other relatives: Mama Plankton (daughter-in-law)
Seymour (father-in-law)
Basia (mother-in-law)
Alvin and the Moe Bros (brothers-in-law)
Enemies: Whales
Krabs family (possibly)
Series information
Appearance: "One Coarse Meal"
Portrayer: Paul Tibbitt
List of characters

Grand Dad Plankton is the grandfather of Sheldon J. Plankton.


He is deep green and has a light yellow eye with a red pupil. He has a gray beard. He has three dark green dots on the top right side of his head.

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When he was an adult, he married Ella.

They had at least two children, both sons. They are Gordon and Silas Plankton.

He, along with other Plankton family members, was eaten by a whale.

He was also grandfather of Sheldon J. Plankton and his numerous cousins.


He appears in Sheldon's nightmare, where Sheldon is eaten by Pearl Krabs and he gets to talk to his grandfather, who is in the same whale.

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