Plankton is his last name. His full name is Sheldon J. Plankton.
plant planktons
Plants and planktons.
I think planktons
jimmithy Spongebob Squarepants
no air and no water
Plankton's computer is named Karen.
His last name is Krabs.
Sqaurepants
the missing robot parts are in kelp forest
Squarepants.
Patrick star!
Patrick Star .
Well if your looking for the answer, you probably dont know ANYTHING about spongebob because theres the easiest answer in the world, and if you dont know you are probably [*ahem*] not very spongebob fan-type. So heres the answer First name: Spongebob Last Name: SquarePants [Middle name not required] Okay bye !
planktons.
Sandy from spongebob squarepants last name is Cheeks so her name is Sandy Cheeks. God Bless Ya!! Root-Beer-Girl
SpongeBob SquarePants' 1st name is SpongeBob.
First Name: Spongebob Surname: Squarepants [Middle name not required]