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 |
| Sound | Richard Harvey | Original Music Composer |
| Camera | Ian Wilson | Director of Photography |
| Editing | Tariq Anwar | Editor |
| Art | Terry Ackland-Snow | Production Design |
| Art | Alan Cassie | Art Direction |
| Art | Fred Hole | Art Direction |
| Art | Simon Wakefield | Art Direction |
| Art | Peter Young | Set Decoration |
| Costume & Make-Up | Tiny Nicholls | Costume Design |
