Tara is captured by the Reptons, who place her in a mind control device to make her their evil queen. She orders her people to destroy Zandor and the Herculoids, who beat them and go to rescue Tara. The Reptons send the Destructo Bats after them, but they escape, recover Tara, free her from the machine's influence, and destroy the Reptons' underground lair.

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