Matt Lucas (Nardole), Justin Chatwin (Grant), Charity Wakefield (Lucy), Tomiwa Edun (Mr Brock), Aleksandar Jovanovic (Dr Sim), Logan H offman (Young Grant), Daniel Lorente (Teen Grant), Sandra Teles (Reporter), Tanroh Ishida (Operator), Vaughn Johseph (Soldier)
In an epic New York adventure, The Doctor and Nardole link up with a reporter and a masked superhero. Can The Doctor save Manhattan from aliens?
The name Doctor Mysterio comes from the name in Mexico for Doctor Who, Doctor Misterio, which Steven Moffat and Peter Capaldi encountered when they visited there in The Doctor Who World Tour. Capaldi in particular fell in love with the name, so M offat decided to use it in an episode title.
This story marks the first time two full stories have been broadcast on Christmas Day.