Searching for the lost world of Atlantis, Prof. Aitken, his son Charles and Greg Collinson are betrayed by the crew of their expedition's ship, attracted by the fabulous treasures of Atlantis. The diving bell disabled, a deep sea monster attacks the boat. They are all dragged to the bottom of the sea where they meet the inhabitants of the lost continent, an advanced alien race that makes sailors their slaves.
Doug McClure
as Greg Collinson
Peter Gilmore
as Charles Aitken
Shane Rimmer
as Captain Daniels
Lea Brodie
as Delphine
Michael Gothard
as Atmir
Hal Galili
as Grogan
John Ratzenberger
as Fenn
Derry Power
as Jacko
Donald Bisset
as Professor Aitken
Ashley Knight
as Sandy
Robert Brown
as Briggs
Cyd Charisse
as Atsil
