Planktonamor Plankton is an ancestor of Plankton and is just as evil. He lived in a castle in a dark landscape on a somewhat of a hill, close to medieval Bikini Bottom. He was the main antagonist of the episode, "Dunces and Dragons."
Planktonamor looks old-aged, considering that he has a grayish-white beard. He looks averagely the same as Plankton, but he has a big light purple cloak with a brown and gold piece in the middle. He is still the same size as Plankton. His beady eye and antennae are also the same as Plankton's.