Hannah John-Kamen (born 7 September 1989) is an English actress. She is known for her roles as a bounty hunter in the Syfy television series Killjoys (2015–2019), Ava Starr / Ghost in the Marvel Cinematic Universe, the title character in the Netflix mystery miniseries The Stranger (2020), and Jill Valentine in the film Resident Evil: Welcome to Raccoon City (2021).