 Donald WoodsJuan Cesare | Juan Cesare |
 Margaret LindsayFlorence Ballau | Florence Ballau |
 C. Aubrey SmithGerard Lytton | Gerard Lytton |
 Henry O'NeillVictor Ballau | Victor Ballau |
 Robert BarratInspector Von Brinkner | Inspector Von Brinkner |
 Florence FairTeresa | Teresa |
 Frank ReicherVon Stein | Von Stein |
 Charles JudelsSalvatore | Salvatore |
 Rafaela OttianoLili Salvatore | Lili Salvatore |
 Paul PorcasiAntonio | Antonio |
 Eily MalyonFredericka | Fredericka |
 Egon BrecherKarl | Karl |
 Herman BingBaker | Baker |
 Henry KolkerAuctioneer | Auctioneer |
 Barlowe BorlandEric (uncredited) | Eric (uncredited) |
 Glen CavenderDetective (uncredited) | Detective (uncredited) |
 Wheaton ChambersServant (uncredited) | Servant (uncredited) |
| CCarlos De ValdezConductor (uncredited) | Conductor (uncredited) |
| CCharles FallonApothecary (uncredited) | Apothecary (uncredited) |
 Betty FarringtonFrieda (uncredited) | Frieda (uncredited) |
 Olaf HyttenScotland Yard Radio Operator (uncredited) | Scotland Yard Radio Operator (uncredited) |
 William IrvingPoliceman Schultz (uncredited) | Policeman Schultz (uncredited) |
 Charles LaneMan in Front Row (archive footage) | Man in Front Row (archive footage) |
 Eric MayneBidder at Auction (uncredited) | Bidder at Auction (uncredited) |
 William V. MongFishback (uncredited) | Fishback (uncredited) |
 David NewellRodrigo (uncredited) | Rodrigo (uncredited) |
 Paul PanzerDetective (uncredited) | Detective (uncredited) |
 Russ PowellFirst Taxi Driver (uncredited) | First Taxi Driver (uncredited) |
| AAdrian RosleyPasquale (uncredited) | Pasquale (uncredited) |
 Ferdinand Schumann-HeinkPoliceman Otto (uncredited) | Policeman Otto (uncredited) |
