Overview
Lieutenant Commander John Byrne of the Naval Secret Service and his partner Pvt. Bill Riggers chase criminal Dr. Sin Fang, who is desperate to find a lost sacred seal. (The fifth and only surviving episode of a six-part serial about an evil mastermind inspired on Sax Rohmer's Dr. Fu Manchu.)
| Actor | Age then | Age now | |
|---|---|---|---|
 | - | - | |
 | 48 | January 1, 1967 (87) | |
 | 39 | October 27, 1970 (82) | |
| - | - | |
| - | - |