During a rafting excursion of an uncharted river canyon, Professor John Butler, wife Kim, kids Katie and Greg and family dog Digger get caught up in a mysterious whirlpool and resurface in a world of prehistoric creatures. Now everyday is an exercise in survival for the adventurous Butler family. They befriend a helpful cave-dwelling family and together must contend with an angry brontosaurus and a dangerous sabertooth tiger - and don't forget the earthquakes and volcanoes!

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Ratings: TVMaze: No Rating
Released: September 7, 1974
Runtime: 30 min
Countries: United States
Companies: CBS
Cast: Frank Welker Don Messick Alan Oppenheimer Jackie Earle Haley Joan Gardner Mike Road Shannon Farnon Melanie Baker Kathy Gori

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