In this thrilling final episode, evil Fu-Manchu's pet marmoset leads sleuth Petrie to a secret Si-Fan ceremony. Is the Devil Doctor's game now up?
| Actor | Role |
|---|---|
| HH. Agar LyonsDr. Fu Manchu | Dr. Fu Manchu |
 Fred PaulNayland Smith | Nayland Smith |
| JJoan ClarksonKaramaneh | Karamaneh |
| HHumberston WrightDr. Petrie | Dr. Petrie |
| FFrank WilsonInspector | Inspector |