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
