Lily James was positively stunning in an Alexander McQueen gown as she walked the red carpet at the Hollywood premiere of Pride and Prejudice and Zombies on Thursday evening. The Downton Abbey star plays an unusual role in the new film.

Pride and Prejudice and Zombies is based on the Jane Austen classic–Pride and Prejudice–but with a significant plot twist involving zombies.

Lily James, in her role as Elizabeth Bennet, is as intriguing on the big screen as she is on the red carpet.

Lily James faces Lena Headey in this thrilling new 'Pride and Prejudice and Zombies' clip: https://t.co/80pazlf5rr pic.twitter.com/ywmrhoSPkt

— Entertainment Weekly (@EW) January 21, 2016

“At first I didn’t understand the concept of zombies and Jane Austen.” But, she said in a recent interview with The Hollywood Reporter. “Then I read it and loved it. I think it’s a really brave, exciting and fun version of the story.”

As those familiar with Austen’s novel know, a pivotal scene takes place between Elizabeth and Darcy, during which Darcy proposes marriage. Zombies play a key role in the new version. Battles are involved.

“We trained really hard. The Bennet sisters all trained together. We learned boxing and kung fu and martial arts, and we had such a great time,” Lily James says of the strength and agility required for the unusual role.

Lily James tops this week's best-dressed list https://t.co/VMmwZ6087E pic.twitter.com/OATKKT46qF

— Grazia UK (@GraziaUK) January 23, 2016

On Thursday night, however, there were no battles, and Lily James–decked out in her dress from Alexander McQueen’s Spring 2016 collection–was delicately graceful. The sheer fabric and floral embroidery helped channel her feminine side, which translated into gorgeous and sexy on the red carpet.

Will you be checking out Pride and Prejudice and Zombies? In addition to Lily James, the film stars Sam Riley, Jack Huston, Bella Heathcote, Douglas Booth, Matt Smith, Charles Dance, and Lena Headey.