An alien distress call draws the Doctor and Peri to Earth, 1985, where they uncover a Cyberman plot to change the course of history.
| Directing | Matthew Robinson | Director |
| Writing | Paula Woolsey | Writer |
| Camera | Alec Wheal | Camera Supervisor |
| Costume & Make-Up | Anushia Nieradzik | Costume Design |
| Art | Marjorie Pratt | Production Design |
| Camera | Godfrey Johnson | Camera Operator |
| Editing | M.A.C. Adams | Editor |
| Sound | Barrie Tharby | Sound |
| Sound | Malcolm Clarke | Music |
| Lighting | Henry Barber | Lighting Director |
| Costume & Make-Up | Linda Bodily | Makeup Artist |
| Production | John Nathan-Turner | Producer |
| Production | Llinos Wyn Jones | Production Assistant |
| Production | Andrew Buchanan | Production Manager |
| Writing | Eric Saward | Script Editor |
| Crew | Dick Mills | Special Sound Effects |
| Sound | Andy Stacey | Sound |
| Visual Effects | Dave Chapman | Visual Effects |
| Editing | Hugh Parson | Editor |
| Visual Effects | Chris Lawson | Visual Effects Designer |
