![Eleven Days, Eleven Nights](https://image.tmdb.org/t/p/w185/gXmH0Fk9VLx9gjGaRxAKsRnh1mr.jpg)
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.