When the TARDIS malfunctions, it and its travellers land on Earth at the size of insects. They uncover a murderous plot involving a new insecticide, but how can they stop the crime in their miniaturised condition?
| Writing | Louis Marks | Writer |
| Directing | Mervyn Pinfield | Director |
| Directing | Douglas Camfield | Director |
| Writing | David Whitaker | Script Editor |
| Production | Verity Lambert | Producer |
| Sound | Dudley Simpson | Music |
| Costume & Make-Up | Jill Summers | Makeup Artist |
| Art | Raymond Cusick | Production Design |
| Production | Mervyn Pinfield | Associate Producer |
| Costume & Make-Up | Daphne Dare | Costume Design |
| Crew | Brian Hodgson | Special Sound Effects |
| Lighting | Howard King | Lighting Director |
| Sound | Alan Fogg | Sound Mixer |
