Tilda Swinton has joined the cast of Marvel's "Doctor Strange."

The actress is in negotiations to join Benedict Cumberbatch in the film, which is being directed by Scott Derrickson.

Swinton will play a Tibetan mystic known as the Ancient One, Strange's Mentor. According to the Hollywood Reporter in the comics, the character is a male. However, after Marvel Studios initially was searched for a male actor, the studio decided on a female.

The Doctor Strange movie is the latest of Marvel's Phase Three Avengers. The character is described as a formerly cocky surgeon who loses the use of his hands, and while on a last ditch attempt to heal himself, discovers magic.

Swinton is no stranger to the action film. Last year she was seen in "Snowpiercer" alongside "Captain America" star Chris Evans and "Fantastic Four" star Jamie Bell. She was also in the 2005 adaptation of DC Entertainment's comic "Constantine," which starred Keanu Reeves and Rachel Weisz.

Swinton won an Academy Award for her role in the 2007 drama "Michael Clayton" and scored rave reviews and a Golden Globe nomination for the 2011 thriller "We Need to Talk About Kevin." She has also been seen in "The Grand Budapest Hotel" and "Moonrise Kingdom," and starred in the Italian language film "I Am Love." The actress will next be seen in the comedy "Trainwreck" and will also be seen in "A Bigger Splash," which will be released by Fox Searchlight. She will also re-team with the Coen brothers after "Burn After Reading" for the film "Hail, Cesar!"

"Doctor Strange" is slated to be released Nov. 4, 2016 and is scheduled to begin shooting November in the U.K. The film will star Academy Award nominee Cumberbatch ("The Imitation Game") and is rumored to star Academy Award nominee Chiwetel Ejiofor ("12 Years a Slave.")