'Doctor Who' trailer offers first look at Maisie Williams' character

The newest trailer for Season 9 of BBC America's "Doctor Who" offers the best look yet at "Game of Thrones" star Maisie Williams, who is guest starring as a mysterious character opposite Peter Capaldi's time-traveling adventurer.

The series will return on BBC in the U.K. and BBC America in the U.S. on September 19.

Jenna Coleman is reprising her role as the Doctor's current companion, Clara, and the trailer also features glimpses of Michelle Gomez as a new version of The Master.

The first season of "Doctor Who" with Capaldi in the title role wound up being the highest-rated season of the series on BBC America. Overall, the season averaged 2.035 million viewers in Live + 3 Day ratings.

The new season will also feature appearances by Tom Stourton, Ariyon Bakare, Simon Lipkin, Ian Conningham, Murray McArthur, Barnaby Kay, John Voce, and Struan Rodger.

More to come...

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See photos of the "Doctor" throughout the shows 50 year run:

Doctor Who Doctors throughout the years
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'Doctor Who' trailer offers first look at Maisie Williams' character
22nd May 1965: William Hartnell (1908 - 1975, centre) stars as the doctor alongside Dracula and Frankenstein's monster in 'The Chase', an episode of the long-running television series 'Dr Who'. (Photo by Clive Limpkin/Express/Getty Images)
Actor Patrick Troughton, who played the second incarnation of the Doctor in the long-running sci-fi series Doctor Who.
20th January 1973: English actor Jon Pertwee (1916 - 1996) poses with two daleks, his nemesis in the long-running TV series 'Dr Who'. (Photo by Monty Fresco/Evening Standard/Getty Images)
Actress Mary Tamm, the latest to team up with Dr Who (Tom Baker), in the long running BBC TV series. Mary plays Romana, a Time Lady. Baker carries evidence of an encounter with a friend's dog, hence the plaster in his lip.
UNITED KINGDOM - JUNE 21: Davison starred as the time-travelling �Doctor� on BBC TV from 1981 to 1984. (Photo by SSPL/Getty Images)
British Actor Colin Baker Who Plays The Doctor In The Bbc Television Series Dr Who. Pictured Here With His Assistant Peri Played By Nicola Bryant And Extras From The Show, 10.04.1986. (Photo by Photoshot/Getty Images)
Actor Sylvester McCoy as Doctor Who, on location at Cloford Quarry near Frome in Somerset.
English actor Paul McGann, August 1990. (Photo by Terry O'Neill/Hulton Archive/Getty Images)
Christopher Eccleston backstage at the House of Fraser British Academy Television Awards held at the Theatre Royal, London (Mandatory Credit: Doug Peters/EMPICS Entertainment)
David Tennant stands infront of the Tardis after arriving for the Doctor Who Series 4 screening at the Apollo West End in central London.

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