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On one of her usual whims, Jeannie (Barbara Eden) transports herself and Tony (Larry Hagman) back to the 17th century, where they end up on the deck of the pirate ship commandeered by the infamous Captain Kidd (Al Wyatt). It just so happens that one of Tony's ancestors, the beauteous Lady Diane Nelson (Elaine Devry), is being held captive on the ship--and if Captain Kidd goes through with his plan to make Lady Diane walk the plank, Tony will cease to exist in the 20th century! Appearing as Capt. Fenwick in this episode is comedian-writer-producer Digby Wolfe), who later helped create the classic 1960s variety series Rowan and Martin's Laugh-In.