| Episode cast overview, first billed only: | |||
| Matt Smith | ... | The Doctor | |
| Jenna Coleman | ... | Clara | |
| Orla Brady | ... | Tasha Lem | |
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James Buller | ... | Dad |
| Elizabeth Rider | ... | Linda | |
| Sheila Reid | ... | Gran | |
| Mark Anthony Brighton | ... | Colonel Albero | |
| Rob Jarvis | ... | Abramal | |
| Tessa Peake-Jones | ... | Marta | |
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Jack Hollington | ... | Barnable |
| Sonita Henry | ... | Colonel Meme | |
| Kayvan Novak | ... | Handles (voice) | |
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Tom Gibbons | ... | Young Man |
| Ken Bones | ... | Voice (voice) | |
| Aidan Cook | ... | Cyberman | |
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. Written by Anonymous
I was really looking forward to this episode and Matt smith is one of my favorite doctors but this was really disappointing the plot sounded good and simple but in my opinion it was all over the place I was looking forward to the end actually. this episode is one of the worst doctor who episodes ever and such a horrible finale for a epic doctor. Steven Moffat is good but maybe bring back Russell. Steven you're good but you should focus on sherlock series 4 but then russell should focus on his own shows. Neil Cross should be the lead writer but Steven is good at most of his episodes like the 50th anniversary that was excellent but he really lost the ball with this one.3/10