- Tom Willett - Lambeth Walk Dancer (uncredited)
- Michael M. Vendrell - Robbie Cole (uncredited)
- 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
- 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)
- 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 hace el papel de Lambeth Walk Dancer (uncredited).
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 hace el papel de Dr. Sam Marlowe.
Robert Forster interpreta a Comdr. Jeff Selkirk en la serie.
Frank Gorshin hace el papel de Dan Wesker.
Mark Harmon interpreta a Peter Cabot en la serie.
Christopher Lee interpreta a John McKenzie en la serie.
Tom Dunstan interpreta a Agra Worker en la serie.
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