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 obviously Sheldon J. Plankton's also all of his cousin's grandfather.
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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