Alvin

Alvin Plankton is the granduncle of Sheldon J. Plankton and is the brother of the Moe Bros and Ella.

Description.

He is the same shape as his mother, Basia, but sports a pink top hat with a red ribbon.

Biography.

He was born to Seymour and Basia. He has three siblings: the Moe Bros and Ella Plankton.

At some point, according to Plankton, "he disappeared without a trace. All they found was his hat in a pool of ketchup".