Bonita Granville

Nancy Drew

John Litel

Carson Drew

James Stephenson

Challon

Frankie Thomas

Theodore 'Ted' Nickerson

Frank Orth

Captain Tweedy

Renie Riano

Effie Schneider, Drew's Maid

Charles Trowbridge

Hollister

Dick Purcell

Keiffer

Edward Keane

Adam Thorne

Mae Busch

Miss Tyson, the Nurse

Tommy Bupp

Spud Murphy (uncredited)

Betty Jane Graham

Brinwood Student (uncredited)

Stuart Holmes

Telegrapher (uncredited)

Vera Lewis

Miss Van Deering (uncredited)

Jack Mower

Radio Station Technician (uncredited)

John Ridgely

Radio Station Technician (uncredited)

Brandon Tynan

Dr. Raymond 'Ray' Spires (uncredited)

Tom Wilson

Brennan, the Gate Guard (uncredited)