The TARDIS arrives in 1925 England where the Doctor ends up playing in a local cricket match due to a case of mistaken identity. The travellers accept an invitation to a masked fancy dress ball, but events take on a more sinister tone as murders are perpetrated at the country home of their host, Lord Charles Cranleigh.
| Writing | Terence Dudley | Writer |
| Directing | Ron Jones | Director |
| Production | John Nathan-Turner | Producer |
| Writing | Eric Saward | Script Editor |
| Sound | Ron Blight | Sound |
| Editing | Rod Waldron | Editor |
| Costume & Make-Up | Lisa Westcott | Makeup Artist |
| Sound | Alan Machin | Sound |
| Camera | Peter Chapman | Camera Operator |
| Editing | Mike Houghton | Editor |
| Crew | Dick Mills | Special Sound Effects |
| Lighting | Fred Wright | Lighting Director |
| Art | Tony Burrough | Production Design |
| Sound | Roger Limb | Original Music Composer |
| Costume & Make-Up | Rosalind Ebbutt | Costume Design |
| Visual Effects | Dave Chapman | Visual Effects |
| Visual Effects | Tony Auger | Visual Effects Designer |
