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.
Elenco: Matt Smith , David Tennant , Arthur Darvill , Karen Gillan , Jenna Coleman , Peter Capaldi , Jodie Whittaker , Billie Piper , Mandip Gill , Bradley Walsh , Tosin Cole , Christopher Eccleston , Freema Agyeman , Catherine Tate , Pearl Mackie , Matt Lucas , John Bishop .