William Leslie

Dr. David Conway

Kathryn Grant

Laura 'Hutch' Hutchinson

Tris Coffin

Dr. Ellis Morton

Raymond Greenleaf

Gov. Chaney

Paul Savage

Ranger Kirk

Fred Coby

Ranger Brown

Frank J. Scannell

Sheriff Quinn

Charles Evans

Gen. Bortes

Marshall Reed

General's Aide

Terry Frost

Chief Rescue Worker

David Armstrong

Military Policeman (uncredited)

Fred F. Sears