Doctor Strange will mark the second installment in the Marvel Cinematic Universe's Phase Three, which will commence next summer with Captain America 3: Civil War. Following the Earth-based clash of heroes, the film will tackle unchartered territory (literally) by introducing audiences to a new breed of superhero rooted in magic, mysticism, and astral projection, while helping set the stage for Avengers: Infinity War - Part One.
With filming set to begin in London in November, the finale pieces of the production puzzle are falling into place. In terms of casting, Benedict Cumberbatch (Sherlock) will play the titular sorcerer supreme, Chiwetel Ejiofor (12 Years a Slave) will play his nemesis Baron Mordo, and Tilda Swinton (Constantine) may play Strange's mystic mentor, The Ancient One. Swinton, though, would not be the movie's female lead. That role could belong to someone else - perhaps Strange's love interest, if Marvel sticks to formula.
Heroic Hollywood is reporting that Rachel McAdams may've been offered the female lead role in Marvel's upcoming Doctor Strange. While McAdams is best know for starring in romantic dramas and comedies (see: The Notebook and Mean Girls), the actress has recently transitioned to more hard-hitting projects, landing a leading role on the second season of True Detective. As such, she would undoubtedly bring further star power and acting prowess to the already impressive casting line-up for the film - that is, assuming there's some fire to the smoke that is this new casting rumor.
And if McAdams' casting does indeed happen, the key question becomes: who could she play? Following Natalie Portman's turn as Jane Foster in the Thor films and Gwyneth Paltrow's portrayal of Pepper Potts in the Iron Man franchise, McAdams would most likely also play an already-established character from Marvel mythology.
In the comics, Doctor Strange has had several love interests, most notably the sorceress Clea and the less prominent Morgana Blessing. As the niece of one of Strange's greatest foes, the demonic tyrant Dormammu, Clea was introduced during a story arc in which Strange confronted Dormammu for the first time in an alternate world called the Dark Dimension. Despite Baron Mordo serving as the primary antagonist in next year's film, Clea's inclusion would thereby set up a potential sequel plot involving the Dark Dimension and Dormammu as the next main villain.
Morgana Blessing, on the other hand, is a writer in the comics who has oscillated between being a friend and love interest of Strange. More recently, she became lovers with the hero's vampire brother, Victor Strange - also known as Baron Blood. While Clea is generally more well known than Morgana, the latter boasts ties to Baron Mordo as well, making her presence all the more likely.
That being said, this all conjectures that McAdam's casting is official. Even if that's not the case, though, there is still potential for one of the two aforementioned characters to make an appearance in the film, just played by another actress. Considering all of Marvel's past movies have included some semblance of a romantic sub-storyline, fans can expect Doctor Strange to follow suit.
Ant-Man opens in theaters July 17, 2015; Captain America: Civil War – May 6, 2016; Doctor Strange– November 4, 2016; Guardians of the Galaxy 2 – May 5, 2017; Spider-Man reboot – July 28, 2017; Thor: Ragnarok – November 3, 2017; The Avengers: Infinity War Part 1 – May 4, 2018; Black Panther – July 6, 2018; Captain Marvel – November 2, 2018; The Avengers: Infinity War Part 2 – May 3, 2019; Inhumans – July 12, 2019.
Source: Heroic Hollywood