<Li> Olivia Cooke as Art3mis / Samantha Cook, a well - known Gunter who works with various allies to ensure the OASIS is kept free and out of the hands of IOI . </Li> <Li> Ben Mendelsohn as Nolan Sorrento, the CEO of Innovative Online Industries who seeks full control over the OASIS . </Li> <Li> Lena Waithe as Aech / Helen Harris, a Gunter and long - time friend of Wade's who works as a mechanic in the OASIS . </Li> <Li> T.J. Miller as i - R0k, a freelance dealer and mercenary often employed by IOI . </Li>

Who played skull guy in ready player one