A break-in and sabotage attempt occurs at a top secret research institute and the culprit is cornered and captured. The problem is that he's been badly injured and claims to have lost his memory entirely. A cat-and-mouse game ensues between investigator Tuxan, the mystery intruder Welles and the people who sent him on the mission.
| Writing | Leslie P. Davies | Novel |
| Writing | Douglas Heyes | Screenplay |
| Production | Hal Roach, Jr. | Producer |
| Production | Trevor Wallace | Producer |
| Sound | Paul Hoffert | Original Music Composer |
| Editing | Edward M. Abroms | Editor |
| Directing | Lamont Johnson | Director |
| Camera | Michael Reed | Director of Photography |
| Crew | David Ostere | Stunt Coordinator |
| Costume & Make-Up | Werner Keppler | Makeup Artist |
| Camera | Ron Drinkwater | Focus Puller |
| Production | Earl A. Glick | Executive Producer |
| Production | Frank Arrigo | Associate Producer |
| Art | Cam Porteous | Set Designer |
| Directing | Roger Good | Assistant Director |
| Production | Harvie McCracken | Unit Production Manager |
| Editing | Bill Lewthwaite | Associate Editor |
| Editing | Roy Piper | Associate Editor |
| Editing | Frederic L. Knudtson | Associate Editor |
| Directing | Margaret Hanly | Script Supervisor |
| Costume & Make-Up | Phyllis Newman | Makeup Artist |
| Costume & Make-Up | Ilse Richter | Wardrobe Supervisor |
| Crew | Herbert Ewing | Special Effects |
| Sound | John W. Gusselle | Sound Mixer |
| Crew | Bob Herron | Stunts |
