Plankton, (A.K.A Sheldon J. Plankton), is Mr. Krab's arch nemeses, who is always trying to steal the secret Krabby Patty formula. His wife is a computer that he built.
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The spongebob charactors are -Spongebob Squarepants -Patrick Star -Squidward Tenticales -Sandy Cheeks -Ugine Crabs or Mr. Crabs -Pearl -Larry Lobster - Mrs. Puff -The Flying Dutchman -Seaweed Monster Man -Sheldon Plankton or Plankton -Don the Whale -JKL (from 'The Big One') for more info on spongebob go to Spongepedia
The main characters of Spongebob Squarepants are Spongebob Squarepants, Patrick Star, Eugene H. Krabs, Squidward Q. Tentacles, Sandra "Sandy" Cheeks, Sheldon J. Plankton, and Gary the snail. Spongebob Squarepants is the primary character that the show is centered on while Plankton is the main antagonist who plots against the Krusty Krab which Eugene Krabs owns. Squidward is Spongebob's neighbor and co-worker. Patrick and Sandy are Spongebob's best friends.
well her name is Karen and yea your right about how Karen is a computer that's married to Sheldon J. Plankton
Well..... First you get the mop from next to the cabinet in the kitchen, then you walk out of the kitchen into the front area and go in front of the menu. Then you right click the mouse and put the mop on the menu. Plankton should say that the SpongeBob robot will fix the words. Then you can walk into Kitchen and pick up the JetPack. It's easy when you know how to do it!! TaDa!!
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."