Character Gallery Alvin is the granduncle of Sheldon J. Plankton who appears in A Plankton Family Tree. 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 in Bikini Bottom. He has three siblings: the Moe Bros and Lily Plankton. At some point, according to Plankton, "he disappeared without a trace. All they found was his hat in a pool of ketchup." Trivia Alvin looks similar to krill. Larval krill are considered planktonic. Plankton (V • E) Sheldon J. Plankton • Clem • Billy Jim Plankton • Joe Plankton • Billy Bob Plankton • Rufus • Billy Billy Bo Billy Banana Fana Fo Filly • Doug • Enis Plankton • Fletcher McGee • Rainchild • Jeke • Flem • Julio • Timmy • Zeke • Dream Plankton • Sheldon J. Plankton (Mr. Plankton's Universe) • Gordon Plankton • Lily Plankton • Plank-Ton • Basia • Alvin • Silas Plankton • Planktonamor • Dead Eye Plankton • King Plankton (character) Retrieved from "https://spongebob.fandom.com/wiki/Alvin?oldid=2411997" Categories: Characters Characters with one appearance Male characters Plankton Book characters Non-series characters Plankton and Karen's family Deceased Comic book characters Community content is available under CC-BY-SA unless otherwise noted.