While taking in the sights of Paris in 1979, the Doctor and Romana sense that someone is tampering with time. Who is the mysterious Count Scarlioni? Why does he seem to have counterparts scattered through time? And just how many copies of the Mona Lisa did Leonardo da Vinci paint?
| Directing | Michael Hayes | Director |
| Writing | Douglas Adams | Writer |
| Writing | Graham Williams | Writer |
| Sound | Dudley Simpson | Music |
| Writing | David Fisher | Writer |
| Production | Graham Williams | Producer |
| Writing | Douglas Adams | Script Editor |
| Costume & Make-Up | Doreen James | Costume Design |
| Costume & Make-Up | Jan Wright | Costume Design |
| Art | Richard McManan-Smith | Production Design |
| Visual Effects | Dave Jervis | Visual Effects |
| Camera | John Walker | Camera Operator |
| Editing | John Gregory | Editor |
| Sound | Graham Bedwell | Sound |
| Costume & Make-Up | Jean Steward | Makeup Artist |
| Production | Rosemary Crowson | Production Assistant |
| Camera | Alec Wheal | Camera Operator |
| Crew | Dick Mills | Special Sound Effects |
| Lighting | Mike Jefferies | Lighting Director |
| Sound | Anthony Philpott | Sound |
| Editing | Rod Waldron | Editor |
| Visual Effects | Ian Scoones | Visual Effects |
