AllMovie

Tim (Bill Bixby) and Martin (Ray Walston) scurry down to Mexico, where an ancient Aztec chest is about to opened during a public ceremony. The chest contains a carved likeness of Martin from one of his previous visits to earth, and he must prevent its being rediscovered lest his true identity be revealed. Complicating matters is the fact that Martin's antennae are locked in the upright position--the consequence of eating too many hot chili peppers!