The accent is on fun and fantasy in this film version of Jules Verne's classic thriller that stars James Mason, Pat Boone and Arlene Dahl. Along the way lurk dangers such as kidnapping, death, sabotage by a rival explorer, and attacks by giant prehistoric reptiles. But they also encounter such magnificent wonders as a glistening cavern of quartz crystals, luminescent algae, a forest of giant mushrooms, and the lost city of Atlantis.