After a nuclear attack, an unlikely group of survivors, including a geologist, a crook and his moll, and a prospector, find temporary shelter in the remote-valley home of a survivalist and his beautiful daughter, but soon have to deal with the spread of radioactivity - and its effects on animal life, including humans.
| Actor | Role |
|---|---|
 Richard DenningRick | Rick |
 Lori NelsonLouise Madison | Louise Madison |
 Paul BirchJim Madison | Jim Madison |
 Mike ConnorsTony Lamont | Tony Lamont |
 Adele JergensRuby | Ruby |
 Raymond HattonPete | Pete |
 Paul DubovRadek | Radek |
 Jonathan HazeContaminated Man | Contaminated Man |
 Paul BlaisdellMutant | Mutant |
 Roger CormanNelson - Louise's Fiancée in Framed Photograph (uncredited) | Nelson - Louise's Fiancée in Framed Photograph (uncredited) |
 Chet HuntleyNarrator (voice) (uncredited) | Narrator (voice) (uncredited) |