Ralph Bellamy as Insp. Steve Trent

Shirley Grey as Betty Lane

Gail Patrick as Helen Stanley

Kane Richmond as Lee Davis

Bradley Page as George T. Noel

Vincent Sherman as Karl Williams

Phillip Trent as Larry King (as Clifford Jones)

Arthur Rankin as Jimmy

Lucien Prival as Gibson

Ward Bond as Jack Baker

Helen Eby-Rock as Jessie Allen

Frank O'Connor as Ballistic Expert

Charles Brinley as Electrician (uncredited)

A.S. Byron as Detective #3 (uncredited)

Stephen Chase as Wallach (uncredited)

Jack Cheatham as Motorcycle Officer (uncredited)

Edmund Cobb as Electrician (uncredited)

Kernan Cripps as Gateman (uncredited)

Budd Fine as Guard #1 (uncredited)

Pat Harmon as Electrician (uncredited)

A.R. Haysel as Detective #2 (uncredited)

William Humphrey as Doctor (uncredited)

Edward Keane as Mr. Richardson - Studio Manager (uncredited)

Sam Lufkin as Motorcycle Officer (uncredited)

Buck Mack as Electrician (uncredited)

Frank Mills as Property Man (uncredited)

Bruce Mitchell as Guard #2 (uncredited)

Earl Pingree as Detective #1 (uncredited)

Hal Price as Reilly (uncredited)

Ky Robinson as Jennings (uncredited)

Dick Rush as Detective #4 (uncredited)

Lee Shumway as Radio Announcer (uncredited)

Cap Somers as Electrician (uncredited)

Ned Winchester as Double (uncredited)