In the episode, "Plankton's Army" Plankton announced his full name once he got to the secret formula. He said, "I, Sheldon Jay Plankton," So his middle name must be "Jay".
However, if you look at the transcript for the epison, Plankton says, "Sheldon J. Plankton." Therefore, his middle name is not mention, but his middle initial is "J."
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Sheldon Plankton and he gets very, very mad at Karen when she calls him Sheldon
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ncraffey
In the episode "Plankton's Army," Plankton's real name is yes, Sheldon...lol
Eric
Plankton's first name in Spongebob is Sheldon.
He is referred to by his nickname, Shelly, in some episodes.
The answer is unknown since Sheldon aka plankton only says “j”. I think the reason is that plankton is scared to say his last name for it might be a girl name, for exampl: juliet
He does not have a middle name.
Keith's middle name is Ronald.
he has no middle name
Her Middle name is Dakota. Her First name is Hannah. Hannah Dakota Fanning.But She is called by her Middle name Not First Name
Harry Style's middle name is Edward.