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First appearing in the closing moments of ''The Time of the Doctor,'' [[Peter Capaldi]] (best known for his role as Malcolm Tucker in the BBC drama, ''The Thick of It'') is the first of a new regeneration cycle for the Doctor. Although his first appearance was ''The Time of the Doctor'', his first official appearance was in ''The Day of the Doctor''. Capaldi is also one of the oldest actors to play the role at age 55, the age William Hartnell was when he played the First Doctor. Making his first full appearance in ''Deep Breath'', show runner Steven Moffat has promised a more raw turn for the Twelfth Doctor. Capaldi also made a guest appearance as Caecilius in the Series 4 episode, ''The Fires of Pompeii,'' which also saw Karen Gillan (Amy Pond) as a Soothsayer. This makes Capaldi the second actor to play the Doctor who has made a past appearance on the show, after Colin Baker, who played the Sixth Doctor. This incarnation of the Doctor is also the first to have a Scottish accent. During Capaldi's run as the Doctor, the Master returned, after being absent since ''The End of Time.'' This is also the first time a female actor, Michelle Gomez, has played the Master, who goes by Missy. This incarnation of the Doctor is the first since the Fifth Doctor to not use the Sonic Screwdriver, instead using Sonic Shades, which are a pair of sunglasses.