Characters played by Boris Karloff
Mr. James Lee Wong
Characters played by Grant Withers
Police Capt. Sam Street
Characters played by Dorothy Tree
Valerie Edwards
Characters played by Craig Reynolds
Peter Harrison
Characters played by Ivan Lebedeff
Michael Strogonoff
Characters played by Holmes Herbert
Prof. Ed Janney
Characters played by Morgan Wallace
Brendan Edwards
Characters played by Lotus Long
Drina
the Maid
Characters played by Chester Gan
Sing
the Butler
Characters played by Hooper Atchley
Carslake
Characters played by Bruce Wong
Asian Man
Characters played by Jack Kennedy
Police Guard
Characters played by Joe Devlin
Police Lt. George Devlin
Characters played by Lee Tong Foo
Willie
Characters played by Wilbur Mack
Ballistics Expert
Characters played by Dick Morehead
Police Detective
Characters played by Steve Carruthers
Party Guest
Characters played by I. Stanford Jolley
Charades-Player