Characters played by Richard Denning
Rick
Characters played by Lori Nelson
Louise Maddison
Characters played by Adele Jergens
Ruby
Characters played by Mike Connors
Tony Lamont
Characters played by Paul Birch
Jim Maddison
Characters played by Raymond Hatton
Pete
Characters played by Paul Dubov
Radek
Characters played by Jonathan Haze
Contaminated Man
Characters played by Paul Blaisdell
Mutant
Characters played by Roger Corman
Nelson - Louise's Fiancee in Framed Photograph
Characters played by Chet Huntley
Narrator