Grand Dad Plankton is the grandfather of Sheldon J. Plankton. He only appears in the episode "One Coarse Meal."
His body is colored deep green and he has a light yellow eye with a red pupil. He also has a gray beard. He has three dark green dots on the top left side of his head as well.
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 the other Plankton family members, are eaten by a whale.
He was also the 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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