Robert Lowery

Ken Morgan

George Macready

Prof. Ernst

Ralph Morgan

Prof. Franklin Arnold

Carole Mathews

Babs Arnold

Willie Best

Flash

Jack Ingram

Dick Nordik

Anthony Warde

Joe Flint

Ted Mapes

Joe Butler

Eddie Parker

Blake

Stanley Price

Mead

Charles King

First Cop with Thor

Kenneth MacDonald

Police Inspector Hamilton

Bud Osborne

Mason

Ray Corrigan

Thor

John Elliott

Prof. Marsden

Kit Guard

Zoo Guard