Character » Plankton appears in 61 issues.
A conspiracy theorist who is the only one that recognizes that Zim is an alien. He is voiced by Andy Berman.
Karen is the co-owner of the Chum Bucket alongside her husband Plankton. She and Plankton are constantly scheming to steal Mr. Krabs' Krabby Patty formula. Karen is typically the brains of the operation, coming up with complex plans to run Krabs out of business (although Plankton has a tendency to take all the credit for them).
Professor Calamitous is Jimmy Neutron's arch-nemesis and greatest rival. He is one of the world's most evil scientists.
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