Basia

Basia Plankton is the great grandmother of Sheldon J. Plankton. She is the wife of Seymour and the mother of Alvin, the Moe Bros, and Ella.

Description.

She is an old plankton with four curled arms and legs, white hair, and stooped posture.

Biography.

At some point, she married Seymour.

Later, they were run out of their hometown for evil scheming and had to move to Switzer City after they got kicked out of Bikini Bottom according to Plankton.

There, they had Alvin, the Moe Bros, and Ella.