The Duchy of Grand Fenwick decides that the only way to get out of their economic woes is to declare war on the United States, lose and accept foreign aid. They send an invasion force (in chain mail, armed with bows and arrows) to New York and they arrive during a nuclear drill that has cleared the streets.
| Directing | Jack Arnold | Director |
| Writing | Roger MacDougall | Screenplay |
| Writing | Stanley Mann | Screenplay |
| Writing | Leonard Wibberley | Novel |
| Production | Walter Shenson | Producer |
| Sound | Edwin Astley | Original Music Composer |
| Camera | John Wilcox | Director of Photography |
| Editing | Raymond Poulton | Editor |
| Visual Effects | Gerald Endler | Mechanical Designer |
| Production | Jon Penington | Associate Producer |
| Production | Leon Becker | Production Supervisor |
| Art | Geoffrey Drake | Art Direction |
| Production | James H. Ware | Production Manager |
| Art | Maurice Binder | Title Designer |
| Camera | Austin Dempster | Camera Operator |
| Sound | Red Law | Sound |
| Sound | George Stephenson | Sound |
| Directing | Philip Shipway | Assistant Director |
| Directing | Pamela Davies | Continuity |
| Sound | Richard Marden | Sound Editor |
| Costume & Make-Up | Stuart Freeborn | Makeup Artist |
| Crew | John Winbolt | Second Unit Cinematographer |
| Costume & Make-Up | Anthony Mendleson | Costume Designer |
| Costume & Make-Up | Joyce James | Hairdresser |
| Sound | Edwin Astley | Conductor |
