Sheldon J. Plankton III

Sheldon J. Plankton III is the grandson of Sheldon Plankton, the son of Shelby Plankton and his wife, an acidic creature, and the father of Sheldon Plankton IV. He wanted to steal King Neptune's crown, but was thwarted by Thomas, Runnervous, Kirby, Spongebob, Gary, and Patrick, who declared Food War VII on him instead. He is implied to have died during the battle.