Who played Dustin Henderson in 'Stranger Things'?

In which TV series is Eleven a main character? Who played Joyce Byers in 'Stranger Things'? Who played Steve Harrington in 'Stranger Things'? In which TV series is Steve Harrington a main character? In which TV series is Dustin Henderson a main character? Who played Mike Wheeler in 'Stranger Things'? Who played Dolores Abernathy in 'Westworld'? Who played Queen Elizabeth II (seasons 1–2) in 'The Crown'?