Dr Gerald Bull was a genius at designing and building superguns (very large long range guns capable of shooting at ranges more than 100 miles). When an operational plan by the CIA to export sanctioned arms to apartheid-South Africa through him was exposed, the CIA denied all knowledge and he went to jail. He was later released, and moved to Belgium to start a subsidiary, of which a major project was to help Saddam Hussein build a new supergun capable of firing over 500 miles.
Unfortunately the movie Doomsday Gun is not yet available on HBO Max.
| Directing | Robert Young | Director |
| Writing | Lionel Chetwynd | Writer |
| Writing | Walter Bernstein | Writer |
| Art | Simon Wakefield | Art Direction |
| Art | Peter Young | Set Decoration |
| Camera | Ian Wilson | Director of Photography |
| Costume & Make-Up | Tiny Nicholls | Costume Design |
| Sound | Richard Harvey | Original Music Composer |
| Art | Alan Cassie | Art Direction |
| Editing | Tariq Anwar | Editor |
| Art | Fred Hole | Art Direction |
| Art | Terry Ackland-Snow | Production Design |
| Directing | Tim Lewis | Second Assistant Director |
