Captain America / Steve Rogers
Dr. Wendy Day
Dr. Simon Mills
Miguel
Helen Moore
Professor Ian Ilson
Stader (as Bill Lucking)
Kramer
Everett Bliss
Yolanda
Doctor
Dr. J. Brenner (as Bill Mims)
Young Man
Young Girl
Mrs. Shaw
Peter Moore
Milt (uncredited)
Les (uncredited)
Minor Role (uncredited)
Cal (uncredited)