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Michael Troughton, son of Patrick Troughton and brother of David Troughton, makes his first appearance in Doctor Who and has a key role. Patrick played the Second Doctor in the classic series of Doctor Who (1963) (1966-69, plus additional appearances through 1985), and David has played various roles in both the classic series and the revival.
References are explicitly made to Alien (1979), which was of course a significant film in the career of John Hurt, who would later go on the play the Time War incarnation of the Doctor. The film was directed by Ridley Scott. In 1963, Scott was a trainee set designer, who was assigned to design the Daleks. However, Scott had to back down, because of a schedule conflict, and was replaced by Raymond Cusick.
This is the third consecutive Christmas special to feature Dan Starkey. He had previously appeared in his recurring Sontaran role, Strax, in "The Snowmen", then as both Commander Skarr and his unnamed subordinate in "The Time of the Doctor".
Shona included 'Thrones marathon' on her Xmas to-do list. Faye Marsay then went to star as the waif in Game of Thrones
This episode saw a one-off modification to the title sequence. The clock faces the TARDIS flies through are blue and icy, and the TARDIS is covered in snow, which both dissipate. The names of the lead actors dissolve into snowy particles, and the subsequent time vortex has flying snowflakes.
