Hannah Dominique E. John-Kamen (born 7 September 1989) is an English actress. She is known for her roles as Yalena "Dutch" Yardeen in Killjoys (2015–2019), Ornela in Game of Thrones (2016), F'Nale Zandor in Ready Player One (2018), Ava Starr / Ghost in the MCU film Ant-Man and the Wasp (2018), and the title character in The Stranger (2020).

She began her career in 2011, providing voice work for the video game Dark Souls. She went on to make appearances in episodes of television series Misfits (2011), Black Mirror (2016), Whitechapel (2012), The Syndicate (2012), The Midnight Beast (2012), and The Hour (2012). From 2012 to 2013, she took the lead role of Viva in the Spice Girls-themed West End musical Viva Forever!

In 2015, she had a starring role in the SyFy series Killjoys. In 2016, she had a guest-star role on the HBO series Game of Thrones. That year, she appeared in the Black Mirror episode "Playtest" and an episode of "The Tunnel". In 2018, she starred in Ready Player One and Ant-Man and the Wasp.

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