Chiwetel Ejiofor's role in Marvel Studios' "Doctor Strange" has been revealed.

The "12 Years a Slave" actor will portray the villain Baron Mordo against Benedict Cumberbatch's Doctor Strange, Deadline reported. The character's first appearance was in the comic "Strange Tales" in 1963.

According to Deadline, Baron Mordo is not "necessarily a completely villainous character," but as "an amalgamation of characters culled from Doctor Strange's mythology."

In the comics, Mordo is a student of the powerful sorcerer known as the Ancient One, who will be played by Tilda Swinton in the movie. When he attempts to kill his mentor to claim the Sorcerer Supreme title, Strange intervened and saved the Ancient One's life, ScreenCrush wrote. As expected, revenge plants itself in the heart of Mordo, resulting to his long-standing dispute against Strange.

Swinton's role as the Ancient One was originally portrayed as a Tibetan male in the comics. According to The Hollywood Reporter, Marvel Studios initially planned to cast a male actor in the role, with IGN noting that some of those considered for the character were Morgan Freeman, Ken Watanabe, and Bill Nighy. The production company, however, reconsidered the part and opted to change the character into a female.

"Doctor Strange" tells the story of a brilliant and arrogant neurosurgeon, Doctor Stephen Vincent Strange, who loses the use of his hands after a car accident. In his quest for a cure, he chances upon the hidden world of magic and alternate dimensions. Screen Rant noted that the origin story introduces the magical realms of the Marvel Cinematic Universe.

Talking to The Wall-Street Journal about his Doctor Strange role, Cumberbatch said that taking on a superhero role doesn't feel like a risk to him because he trusts Marvel.

"I don't think it's a risk because of Marvel," the 38-year-old actor told the news outlet. "Marvel is a stable of bringing out ordinary comic characters and turning them into screen-like gods. It's very different, it's an Astral Plane. There's a huge new element to this Marvel universe that's going to be employed in building this story and this character."

According to Cumberbatch, he is looking forward to working with filmmaker Scott Derrickson, but the movie star also admitted that he didn't read the "Doctor Strange" comics -- or any at all -- when he was a kid.

"But you can bet your bottom dollar I'm reading them now, avidly," the "Imitation Game" star added, as quoted by The Wall-Street Journal.

As for how he prepares for the film, Cumberbatch said that he is incorporating his own spirituality to his portrayal of Doctor Strange. Last December, Derrickson tweeted a fan art photo showcasing Cumberbatch's lead character as a teaser for the film.

Derrickson directs "Doctor Strange" from a script written by Jon Spaights, Deadline noted. The film, which set for release in theaters on November 4, 2016, is produced by Kevin Feige and is expected to begin shooting in the U.K. come November, The Hollywood Reported noted.