"HALF MAN...HALF BEAST...He held them all in the grip of deadly terror...nothing could keep him from this woman he claimed as his own!"
A scientist develops a formula which will cause animals to regress to the form of their primitive ancestors, and tries it on himself with disastrous results.
Prof. Clifford Groves

Dr. Ross Harkness

Jan Groves
Ruth Marshall

Game Warden George Oakes
Celia

Nola Mason, bar waitress

Sheriff Andy Andrews

Charlie Webb, bar owner
Mr. Wheeler, hunter

Danny, a townsman

Buck Hastings, a townsman
Jim Newcomb, a townsman

Skeptical Naturalist

Naturalists' Conference Chairman
Dr. Fairchild

Thickset Townsman at Webb's Cafe
State Trooper Dispatcher