 Peter van EyckHenry B. Travers | Henry B. Travers |
 Gert FröbeDetective Inspector Kras | Detective Inspector Kras |
 Wolfgang PreissProf. Jordan / Peter Cornelius / Dr. Mabuse | Prof. Jordan / Peter Cornelius / Dr. Mabuse |
 Dawn AddamsMarion Menil | Marion Menil |
 Werner PetersHieronymus B. Mistelzweig | Hieronymus B. Mistelzweig |
 Andrea ChecchiHotel Detective Berg | Hotel Detective Berg |
 Howard VernonNo. 12 | No. 12 |
| DDavid CameronMichael Parker | Michael Parker |
 Christiane MaybachMaid | Maid |
 Albert BesslerHotelingenieur | Hotelingenieur |
| MMarielouise NagelThe Blonde Luck | The Blonde Luck |
 Reinhard KolldehoffRoberto Menil aka 'Klumpfuß' | Roberto Menil aka 'Klumpfuß' |
 Nico PepeHotel-Manager | Hotel-Manager |
 Jean-Jacques DelboCornelius' Butler | Cornelius' Butler |
 Linda SiniCorinna | Corinna |
 Renate KüsterTV announcer | TV announcer |
| RRolf WeihInterpol-Chef | Interpol-Chef |
 Rolf MoebiusPolice-Officer | Police-Officer |
| MMaria MildeChambermaid | Chambermaid |
 Dieter HallervordenPhotojournalist (uncredited) | Photojournalist (uncredited) |
 Bruno W. PantelReporter (uncredited) | Reporter (uncredited) |
 Wolfgang VölzBarkeeper Karl (uncredited) | Barkeeper Karl (uncredited) |
| WWerner ButtlerNo. 11 (uncredited) | No. 11 (uncredited) |
| HHans W. HamacherBKA-Chef (uncredited) | BKA-Chef (uncredited) |
| EEgon VogelPolice doctor (uncredited) | Police doctor (uncredited) |
