She appeared in the action comedy Barely Lethal (2015) and portrayed a young Jean Grey / Phoenix in the X-Men film series (2016–2019).

Turner was born in Northampton,[3] England on 21 February 1996, the daughter of Sally, a nursery school teacher, and Andrew, who works for a pallet distribution company.

[7] Turner was cast as Sansa Stark, a young noblewoman, in the HBO fantasy drama series Game of Thrones in August 2009.

[2] Turner's drama teacher encouraged her to audition for the part,[11] and she dyed her blonde hair auburn for the role, although in season 7 she began wearing wigs.

[12] While playing Sansa Stark, Turner was told to lose weight and she said she suffered from mental health problems while spending her teenage years on screen.

[14][15] In 2013, Turner had her first movie role as the lead character in the independent thriller film Another Me, based on the novel of the same name by Catherine MacPhail.

[21] Turner played mutant Jean Grey in X-Men: Apocalypse, which was released in May 2016 to mixed critical success.

[27] In November 2017, Turner was cast to play Juliane Koepcke in the movie Girl Who Fell From the Sky.

[29] Turner reprised her role as Jean Grey in the X-Men film Dark Phoenix, which takes place in 1992 and follows the events of Apocalypse.

The scene went viral due to Turner's delivery of the line, which she admitted was intentionally played to emulate cinema outbursts from actors like Leonardo DiCaprio and Jack Nicholson.

[44][45] Later that month, she sued her estranged husband to allow their daughters, who were born in the United States, to return to the UK, as the former couple had registered the latter as their permanent residence in April earlier that year.