The 3 Worlds of Gulliver isle Brobdingnag, unaware that it was inhabited by Brobdingnagians, a race of 60 foot giants. After making shore, he encounters a very kind 40 foot peasant brobdingnagian girl named Glumdalclitch (Sherry Alberoni) finds him on the shore and carries him to the castle of King Brob (Grégoire Aslan) Their law requires that all tiny people be brought to the King, who has a collection of "tiny animals". Gulliver is delighted to find Elizabeth, who was washed ashore following a shipwreck. The King installs the two in a dollhouse and lets Glumdalclitch look after them. The King marries Gulliver and Elizabeth.
Land of the Giants the part of Dan Ericson, credited his previous football, track and pole vaulting work for helping him with the stunts required. Elements of Allen's "Lost in Space" series recur in "Land of the Giants", notably the relationship between foolish, greedy, on-the-run bank robber Alexander B. Fitzhugh (Kurt Kasznar) and the young boy Barry Lockridge (Stefan Arngrim), paralleling the relationship on "Lost in Space" between Doctor Smith and the young Will Robinson. Also, for main cast billing, Kasznar was treated contractually in the same manner as Jonathan Harris had been on "Lost In Space": billed in last place on the opening