The cast of Stranger Things Season 4 includes these actors: • Winona Ryder played Joyce Byers • David Harbour played Jim Hopper • Millie Bobby Brown played Eleven / Jane Hopper • Martie Blair played Young Eleven • Finn Wolfhard played Mike Wheeler • Gaten Matarazzo played Dustin Henderson • Caleb McLaughlin played Lucas Sinclair • Noah Schnapp played Will Byers • Sadie Sink played Max Mayfield • Belle Henry played Young Max • Natalia Dyer played Nancy Wheeler • Charlie Heaton played Jonathan Byers • Joe Keery played Steve Harrington • Maya Hawke played Robin Buckley • Brett Gelman played Murray Bauman • Priah Ferguson played Erica Sinclair • Matthew Modine played Martin Brenner • Paul Reiser played Sam Owens • Jamie Campbell Bower played Henry / Vecna / One • Raphael Luce played Young Henry Creel • Cara Buono played Karen Wheeler • Eduardo Franco played Argyle • Joseph Quinn played Eddie Munson