Orbiting a quiet backwater planet, the massed forces of the universe's deadliest species gather, drawn to a mysterious message that echoes out to the stars. And amongst them, the Doctor. Rescuing Clara from a family Christmas dinner, the Time Lord and his best friend must learn what this enigmatic signal means for his own fate and that of the universe.
| Production | Marcus Wilson | Producer |
| Camera | Neville Kidd | Director of Photography |
| Writing | Steven Moffat | Writer |
| Production | Steven Moffat | Executive Producer |
| Directing | Jamie Payne | Director |
| Production | Brian Minchin | Executive Producer |
| Costume & Make-Up | Howard Burden | Costume Design |
| Costume & Make-Up | Emma Cowen | Makeup Artist |
| Costume & Make-Up | Lin Davie | Makeup Designer |
| Costume & Make-Up | Danny Marie Elias | Makeup Artist |
| Art | Lucienne Suren | Art Direction |
| Costume & Make-Up | Clare Golds | Makeup Artist |
| Costume & Make-Up | Claire Pritchard | Makeup Supervisor |
| Art | Michael Pickwoad | Production Design |
| Art | Adrian Anscombe | Set Decoration |
| Editing | St. John O'Rorke | Editor |
| Sound | Murray Gold | Original Music Composer |