Health officials from the World Health Organization link a smallpox outbreak in Europe to oil drilling in the Middle East.
| Directing | Don Chaffey | Director |
| Art | Elliot Scott | Art Direction |
| Production | Denis Johnson | Production Manager |
| Writing | Paul Dickinson | Writer |
| Writing | Patricia Lee | Adaptation |
| Writing | Milton Holmes | Screenplay |
| Writing | Harold Buchman | Screenplay |
| Production | Milton Holmes | Producer |
| Production | Walter Shenson | Producer |
| Sound | Edwin Astley | Original Music Composer |
| Camera | Erwin Hillier | Director of Photography |
| Editing | Frank Clarke | Editor |
| Production | Irene Howard | Casting |
| Costume & Make-Up | Anthony Mendleson | Costume Design |
| Costume & Make-Up | Tony Sforzini | Makeup Artist |
| Directing | Dennis Bertera | Assistant Director |
| Sound | Norman Coggs | Sound Recordist |
| Sound | J.B. Smith | Sound Recordist |
| Sound | A.W. Watkins | Recording Supervision |
| Crew | Tom Howard | Special Effects |
| Camera | Harold Haysom | Second Unit Director of Photography |
| Camera | Tony White | Camera Operator |
| Costume & Make-Up | Eileen Sullivan | Wardrobe Supervisor |
| Sound | Edwin Astley | Conductor |
| Directing | Phyllis Crocker | Continuity |
