Sidney Toler as Charlie Chan

Benson Fong as Tommy Chan

Mantan Moreland as Birmingham Brown, Chauffeur

Robert Homans as Capt. Flynn

I. Stanford Jolley as Rolf Brot, alias Ralph Brett

Virginia Brissac as Mrs. Marsh

Jack Norton as Willie Rand

Janet Shaw as Gloria Bayne

Ben Carter as Ben Carter

Victoria Faust as Hulda Swenson / Janet Carter

Helen Deverell as Diane Hall

Leonard Mudie as Horace Karloss

Reid Kilpatrick as Mr. Chester, program announcer

Emmett Vogan as Mr. Hamilton

Crane Whitley as Henchman Cooper

Kernan Cripps as Detective (uncredited)

Charles Jordan as Nelson (uncredited)

Kenner G. Kemp as Police Radio Expert (uncredited)

Milton Kibbee as Herbert Sinclair (uncredited)

Frank Mayo as Det. Hodge (uncredited)

Leonard Mudie as Horace Karlos (uncredited)

Tom Quinn as Chemist (uncredited)

Charles Sherlock as Sgt. McGraw (uncredited)

Charles Wagenheim as Rausch (uncredited)