Writer Steven Moffat commented:
Everybody hide - Michelle Gomez as Missy was an instant hit last year, so she’s straight back to plague the Doctor and Clara in the series opener. But what brings her back into their lives is the last thing they’d expect.
Michelle Gomez said:
Things have been a little beige since I left Missy behind, so I'm delighted to be putting my lippie back on. I'm positively dying to see The Doctor again!The BBC website have also presented a video message from the actress:
The premiere will also see the return of Jemma Redgrave as Kate Lethbridge-Stewart, who appears alongside UNIT in the current block directed by Hettie MacDonald. The episodes will also feature Kelly Hunter (who previously played the Shadow Architect in The Stolen Earth), Clare Higgins (Ohila in The Night of the Doctor) and Jaye Griffiths (perhaps best remembered by sci-fi fans as Ros Henderson in Bugs).
Other guest stars appearing in the series include Daniel Hoffmann-Gill, Jami Reid-Quarrell, Aaron Neil, India Ria Amarteifio, Joey Price, Dasharn Anderson, Harki Bhambra, and Demi Papaminas.