Richard Derr as David Randall

Barbara Rush as Joyce Hendron

Peter Hansen as Dr. Tony Drake

John Hoyt as Sydney Stanton

Larry Keating as Dr. Cole Hendron

Rachel Ames as Julie Cummings

Stephen Chase as Dr. George Frye

Frank Cady as Harold Ferris

Hayden Rorke as Dr. Emery Bronson

Sandro Giglio as Dr. Ottinger

Kirk Alyn as Rioter Bringing Guns (uncredited)

James Congdon as Eddie Garson (uncredited)

Gertrude Astor as Traveler (uncredited)

Robert Chapman as Student (uncredited)

Gene Collins as Newsdealer (uncredited)

Marcel De La Brosse as Headwaiter (uncredited)

Estelle Etterre as Traveler (uncredited)

Paul Frees as Narrator/U.S. President (voice)

Gay Nelson as Leda (uncredited)

Edna Smith as

Mary Murphy as Student