Doug McClure (Greg Collinson)
Peter Gilmore (Charles Aitken)
Shane Rimmer (Capt. Daniels)
Lea Brodie (Dephine Briggs)
Michael Gothard (Atmir)
Ashley Knight (Sandy)
Robert Brown (Briggs)
Daniel Massey (Atraxon)
Hal Galili (Grogan)
Cyd Charisse (Atsil)
John Ratzenberger (Fenn)
Derry Power (Jacko)
Donald Bisset (Prof. Aitken)