The next series of Doctor Who will see some of the biggest changes to the show since it returned in 2005, according to writer and executive producer Steven Moffat. Fans have been given a first glimpse of series eight, which will arrive on TV screens in August, with a first-look trailer showing new Time Lord Peter Capaldi in the Tardis. Thick of It star Capaldi made his debut in the 50th anniversary special, The Day of the Doctor, last year when he turned up to help save the planet of the Time Lords. Here's what we can expect from his next adventure...
'Mad and dangerous' doctor
Doctor Who fans can expect a "radical" change from David Tennant and Matt Smith's incarnations of the Time Lord. Moffat has said it is time for the show to "flip around a bit". He told Doctor Who Magazine: "The last two Doctors have been brilliant, and have been your 'good boyfriend' Doctors (now sis). But the Doctor isn't always like that. There is the sort of Tom Baker, Christopher Eccelston end of the spectrum, where he is mad and dangerous and difficult." Capaldi's new costume was revealed earlier this year, and described by the actor as "no frills, no scarf, no messing, just 100 per cent rebel Time Lord".
Clara kept on her toes
How will companion Clara Oswald react to the new Doctor? Moffat hints that "control freak" Clara, played by Jenna Louise Coleman, will be led on a "merry dance" by the "much older, fiercer, madder, less reliable" Doctor. Working with Matt Smith's Doctor in series seven, Clara seemed "so totally in control and so sort of perfect and sweet that you really wanted to mess her around a bit and say, now let's give her a situation that she can't control", says Moffat.
Gavin & Stacey actor Samuel Anderson will be joining the cast as a second companion, Danny Pink, a teacher at Coal Hill School where Clara works. Actress Ellis George is also believed to be playing a pupil at the school, reports Den of Geek. Moffat has hinted that Coal Hill will play a key role in the series and will even come to the aid of the Tardis for the fourth time in Doctor Who history. Meanwhile, members of the 'Paternoster Gang' will reprise their roles. Neve McIntosh will return as Madame Vastra, Dan Starkey as Strax and Catrin Stewart as Jenny Flint.
Line of Duty star Keeley Hawes plays an evil alien banker called Ms Delphox, while Ben Miller, of the Armstrong and Miller comedy duo, will play the Sheriff of Nottingham in a Robin-Hood-themed episode. Comedian Frank Skinner, a long-time fan of the show, is also expected to pop up in the new series. Details of his character are yet to be announced, but Moffat says Skinner has been volunteering to be "third monster on the left" for as long as he has worked on the show.
Monsters and villains
Aside from Ms Delphox and the Sheriff of Nottingham, Doctor Who is expected to take on Daleks, creepy robots and a creature that looks like a Minotaur. The first episode, set in Victorian London, is rumoured to include Clockwork Droids, originally seen in the series two episode The Girl in the Fireplace in 2006. The Master is also rumoured to return as a major villain in the series, which will have 12 episodes and a 13th serving as the Christmas Special. However, both the return of the Clockwork Droids and the Master are yet to be confirmed.