A rogue scientist near a small desert town arouses the suspicion of the town's doctor when his lab assistant is found dead from a case of acromegaly, which took only four days to develop. As the doctor investigates, aided by the scientist's new female assistant, they discover that something is devouring local cattle and humans in increasingly large quantities.
John Agar
as Dr. Matt Hastings
Mara Corday
as Stephanie 'Steve' Clayton
Leo G. Carroll
as Prof. Gerald Deemer
Nestor Paiva
as Sheriff Jack Andrews
Ross Elliott
as Joe Burch
Hank Patterson
as Josh
Eddie Parker
as Paul Lund / Eric Jacobs / Airport Workman
Bert Holland
as Barney Russell
Raymond Bailey
as Dr. Townsend
Steve Darrell
as Andy Andersen
Edwin Rand
as Lt. John Nolan
Clint Eastwood
as Jet Pilot
