We reported earlier that Michelle Gomez will be reprising her role as Missy in the new series. Further details have since emerged.
Missy will feature in the Series 9 two-part opener, the episodes of which have been confirmed as being called The Magician's Apprentice and The Witch's Familiar.
On her return to Doctor Who, 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!
Executive Producer and Lead 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.The premiere will also see the return of Jemma Redgrave as Kate Lethbridge-Stewart, appearing with 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.