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In page Land of the Giants:

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Land of the Giants guest stars included many familiar faces from other 1950s and 1960s sci-fi/fantasy and adventure series (e.g. Star Trek, The Twilight Zone, Gilligan's Island, Lost in Space, I Dream of Jeannie). These popular, well-known character actors included Jack Albertson, Chris Alcaide, Michael Ansara, John Carradine, Yvonne Craig, Charles Drake, Alan Hale, Jr, Jonathan Harris, David Opatoshu, Larry Pennell, and Warren Stevens.