The cast of "Mister" includes Katherine LaNasa, Pom Klementieff, Matthias Schweighöfer, Micheál Neeson, and rising child actress Serenity Grace Russell. The film marks the directorial debut of legendary second unit and action director Wade Eastwood, who has previously directed films such as "Mission: Impossible – Final Reckoning" and "Jumanji: The Next Level. The project was first announced at the Cannes Film Festival and began principal photography in Madrid and the Canary Islands in March. LaNAAS is known for her portrayal of E.R. charge nurse Dana Evans on HBO's "The Pitt," which earned her an Emmy Award and a Critics' Choice Award.