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The Quest team embarks upon a South American expedition, accompanied by Jessie's mother (and Race's ex-wife) Estella Velasquez. Searching for the reasons that an ancient Incan-esque tribe apparently vanished from the face of the earth, the team is imperilled by a madman who plans to use an army of mummies to unleash the same deadly virus that killed his ancestors. Originally telecast December 11, 1996, "Mummies of Malenque" was the first episode of The Real Adventures of Jonny Quest's second season, as witness a number of major changes in the voice cast and several overhauled character designs.