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Power Wrench

Zach Varmitech is the first recurring villain in Wild Kratts. He is an inventor who has a rivalry with Aviva and the Kratt brothers. Zach often attempts to steal the Wild Kratts' technology and to turn animals into robots. Zach is portrayed very comically. As a running gag, he refers to the Wild Kratts as the "Wild Rats," with the Wild Kratts usually correcting him