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I.M. Werfzel is a Plumber stationing on Earth who first appeared in Rad Monster Party.
Just like his name, his appearance is based on two of Michael Dorn's roles; I.M. Weasel and Worf.
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Ben 10: Omniverse
I.M. Werfzel is a combination of Michael Dorn's two famous roles. First being I.M. Weasel, from I Am Weasel and the second being Worf from Star Trek.