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While his family takes refuge in a huge cave, Will (Bill Mumy) comes across the ruins of a long-dead civilization--and also finds a young girl (Kym Karath) in a state of suspended animation. Awakening her with a kiss, Will discovers that the girl is actually a princess, and that according to the rules of her race he must now marry her. This is daunting enough, but there's more to come: Will is now also expected to lead the survivors of the Princess' civilization (also awakened from suspended animation) on a military campaign to conquer the universe! Watch for part of the "Seaview" set from the concurrently produced Irwin Allen series Voyage to the Bottom of the Sea. Also: this episode reunites child actresses Angela Cartwright and Kym Karath, who had previously played two of the Von Trapp kids in The Sound of Music.