Hagen Arnold
Karen Summers
Dr. Crowther
Gregory Gallea
Col. Holt
Dr. Lee Craig (as Phillip E. Pine)
Dr. Tony Verity
Col. Cowen
Dr. George Tarvin
Maj. Tolley
Sybil Dennis
Stover
Overseer
Sen Chiu (as Key Luke)
Hicks
Highway Patrolman (uncredited)