During a visit to a local diner the doctor stumbles upon a mysterious alien artefact that leads him on a mission to rescue Rivesh Mantilax from the threat of the Viperox and the clutches of the American military in New Mexico.
| Creator | Sydney Newman |
|---|---|
| Actor | Jodie Whittaker, Mandip Gill, John Bishop |
| Country | Canada, United Kingdom |
| Production | BBC Cymru Wales |