Darren McGavin

as Carl Kolchak

Carol Lynley

as Gail Foster

Simon Oakland

as Tony Vincenzo

Ralph Meeker

as Bernie Jenks

Claude Akins

as Sheriff Warren A. Butcher

Charles McGraw

as Police Chief Ed Masterson

Kent Smith

as District Attorney Tom Paine

Elisha Cook Jr.

as Mickey Crawford

Stanley Adams

as Fred Hurley

Larry Linville

as Dr. Robert Makurji

Jordan Rhodes

as Dr. John O'Brien

Barry Atwater

as Janos Skorzeny

Edward Faulkner

as Las Vegas Policeman (uncredited)

Virginia Gregg

as Mrs. Brandon (uncredited)

Buddy Joe Hooker

as Intern (uncredited)

Irene Cagen

Edward Faulkner

Sig Frohlich

Eddie Garrett

Virginia Gregg

Buddy Joe Hooker

Monty O'Grady

Peggy Rea

Mark Russell

George Simmons