Professor Membrane appears in 23 issues.
Clembrane is a clone of Professor Membrane made by Zim. He has a liking for chocolate pudding.
A conspiracy theorist who is the only one that recognizes that Zim is an alien. He is voiced by Andy Berman.
Dib's indifferent sister who could care less about his ravings of aliens and Bigfoot. She likes playing video games and eating pizza. She is voiced by Melissa Fahn.
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