Alvin is the granduncle of Sheldon J. Plankton who appears in the comic A Plankton Family Tree.


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


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."


  • Alvin looks similar to krill. Larval krill are considered planktonic.
Plankton (VE)

Sheldon J. PlanktonClemRufusRainchildSheldon J. Plankton (Mr. Plankton's Universe)Gordon PlanktonLily PlanktonBasiaAlvinSilas PlanktonPlanktonamorDead Eye PlanktonGrand Dad PlanktonGreen PlanKrabIdeal PlanktonCousin MarvinDream Lily PlanktonMama PlanktonMoe BrosPlanKrabPlankton zombiesPlanktonamorRed PlanKrabSeymourSheldon J. Plankton (Bikini Bottom 2)

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