The Doctor's wort enemies, The Daleks, The Cybermen, The Angels and The Silence, return, as the doctor's eleventh life comes to a close, and his twelfth life begin.
       Orbiting a quiet backwater planet, the massed forces of the univere's deadliest species gather, drawn to a mysterious message that echoes out to the star - 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 mean for his own fate and that of the univere.