John-Kamen, 26, is best known for playing interplanetary bounty hunter Dutch in the Syfy series, Killjoys. You also might recognize her as Ornela, a Dothraki widow, from the sixth season of HBO's Game of Thrones.
John-Kamen joins a cast that already includes Tye Sheridan as Wade Watts, Olivia Cooke as Art3mis, Simon Pegg as Orgen Morrow, Ben Mendelsohn as Nolan Sorento, T.J. Miller as i-R0k, Win Morisaki as Daito, and Mark Rylance as James Donovan Halliday.
The story of a virtual-reality game creator who offers up his entire company to the best player who can find an Easter egg in one of his many virtual worlds via a game called OASIS. A teenager named Wade Watts decides to take it on after millions have failed over many years. The key to winning the game is a plethora of pop culture clues from the 1980s. Whomever figures it out and wins the game — without having their avatars killed in the process — takes over the entire OASIS empire.
Three-time Academy Award winner Steven Spielberg ("Schindler's List," "Saving Private Ryan") is directing Ready Player One. The film is being produced by Spielberg; Donald De Line, under his De Line Pictures banner; Dan Farah; and Spielberg's longtime colleague Kristie Macosko Krieger; with Bruce Berman serving as executive producer.
Ready Player One will open in theaters on March 30, 2018.