Look I'll just cut to the chase. Do you have a dirty shell and hate bath time?
— Sheldon R. Shellcleaner, "Shellback Shenanigans'

Sheldon R. Shellcleaner is an alter-ego of Plankton who appears in the episode "Shellback Shenanigans."


He has the same form as Plankton, but has a black afro and sideburns, a gray mustache, and wears brown suit and pants, a light yellow undershirt, a red bow tie, and a pair of black shoes. He carries a gray briefcase.

Role in episode

He arrives at SpongeBob's house, offering Gary a one-night stay at Club Shell. He then offers to give Gary a temporary shell to replace his dirty one, which he accepts. Gary leaves, and Plankton takes off his disguise to disguise himself as Gary in an attempt to obtain the Krabby Patty secret formula.


  • His last name comes from his made-up occupation, as the owner and operator of the fictional company, Super Shell Cleaner Vacations Unlimited.
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