The upcoming Doctor Strange movie is looking increasingly British as Deadline reports that actor Chiwetel Ejiofor is joining Benedict Cumberbatch — and possibly Tilda Swinton — in the film.

The British actor, who’s recently won many accolades for his role in 12 Years a Slave, is said to be playing Baron Mordo, Doctor Strange’s rival and enemy.

He’s also known in the geek circles for his portrayal of the Operative in Serenity.