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The Keeper, played by Michael Rennie, is a zoo keeper. He wants to take the children and add them to his collection. This episode is the only two-parter from the series.
Episodes
1The Reluctant Stowaway 2The Derelict 3Island in the Sky 4There Were Giants in the Earth 5The Hungry Sea 6Welcome Stranger 7My Friend, Mr. Nobody 8Invaders from the Fifth Dimension 9The Oasis 10The Sky Is Falling 11Wish Upon a Star 12The Raft 13One of Our Dogs Is Missing 14Attack of the Monster Plants 15Return from Outer Space 16The Keeper (1) 17The Keeper (2) 18The Sky Pirate 19Ghost in Space 20War of the Robots 21The Magic Mirror 22The Challenge 23The Space Trader 24His Majesty Smith 25The Space Croppers 26All That Glitters 27The Lost Civilization 28A Change of Space 29Follow the Leader