- Robert Paul Jordan - (voice)
- John Berwick - Crewman
- Laurence Haddon - Cpt. Volero (uncredited)
- Julie Bennett - Sylvia King
- Michael White - PC18 Officer
- Sandy Simpson - Moore
- John Brandon - Chief Engineer (uncredited)
- Clete Roberts - Newscaster (uncredited)
- Kirk Cameron - Liam
- Hedley Mattingly - Bailey
- Peter Stader - Ed Linder (uncredited)
- Lawrence Levine - (uncredited)
- Michael Evans - Eric Whittaker
- Alan Fudge - Lew Bascomb
- Warwick Sims - Luke Crane
- Lori Lethin - Maria (uncredited)
- Laird Stuart - Paul (uncredited)
- Peter von Zerneck - Hoffman
- Kip Niven - Gantman (uncredited)
- George Innes - Dave Winter
- Belinda Mayne - Sally Crane
- Duncan Regehr - Paul Ryker
- Colin Drake - Old Man
- Jean Marsh - Dr. Goldman
- John McIntire - Sen. Oliver Bartholomew
- Emma Samms - Lea McKenzie
- Christina Nigra - Beth
- Irene Hervey - Carrie (uncredited)
- John Ratzenberger - Bill Sweeney
- Lawrence Benedict - Young Bailey (uncredited)
- Michael M. Vendrell - Robbie Cole (uncredited)
- Tom Willett - Lambeth Walk Dancer (uncredited)
- Jeanette Nolan - Sarah Bartholomew
- Alan Caillou - Goliath Captain (uncredited)
- Glen Sanford
- Kevin Connor
- Mark R. Schilz
- Lee Walkling
- Jonathan Giles Zimmerman
- Richard M. Bluel
- Hugh Benson
- Larry White
- Meryl O'Loughlin
- Mike Fenton
- Robert J. Anderson
- Pat Fielder
- Michael Jiron
- Erma E. Levin
- David Cates
- George Duning
- Tom Beckert
- Wayne Artman
Tom Willett interpreta a Lambeth Walk Dancer (uncredited) en la serie.
Michael M. Vendrell interpreta a Robbie Cole (uncredited) en la serie.
Eddie Albert interpreta a Adm. Wiley Sloan en la serie.
John Carradine hace el papel de Ronald Bentley.
Alex Cord interpreta a Dr. Sam Marlowe en la serie.
Robert Forster hace el papel de Comdr. Jeff Selkirk.
Frank Gorshin hace el papel de Dan Wesker.
Mark Harmon hace el papel de Peter Cabot.
Christopher Lee interpreta a John McKenzie en la serie.
Tom Dunstan interpreta a Agra Worker en la serie.
Capítulo disponible en las siguientes plataformas:
