Marvel Studios' Phase Two is well under way, with Iron Man 3 kicking things off in May, followed by Thor: The Dark World in November and Captain America: The Winter Soldier next spring. The studio is also gearing up for its Phase Three lineup, which producer Kevin Feige revealed in January will include Ant-Man and possibly Doctor Strange.

The studio announced last month that three untitled movies will be released in 2016 and 2017, with Doctor Strange believed to be one of those three movies.

Today we have an unconfirmed report that Marvel Studios is eyeing Joseph Gordon-Levitt as the number one candidate to play Doctor Strange, a character that will likely replace Robert Downey Jr.'s Tony Stark as the rich, snarky playboy-like presence of the Marvel Studios film universe should Downey completely step down as Iron Man.

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An official offer hasn't been made to the actor yet, but insiders reveal that Marvel executives are internally discussing the possibility of hiring the actor soon. The 32-year-old Joseph Gordon-Levitt is just the right age for the part, since the Sorcerer Supreme in Thomas Dean Donnelly and Joshua Oppenheimer's script is crafted for someone in their early 30s. The actor and his representatives are likely unaware of these discussions, so it is believed that he will not be on hand at Comic-Con 2013, where an official announcement regarding Marvel Phase Three is expected to be made.

The actor was being considered for the Star-Lord role in Guardians of the Galaxy back in January, a role that ultimately went to Chris Pratt. No director has been attached to Doctor Strange at this time.

Doctor Strange is a former neurosurgeon, a practicing sorcerer, and serves as the Sorcerer Supreme, the primary protector of Earth against magical and mystical threats. What do you think? Is Joseph Gordon-Levitt the perfect choice? Or does he look too young to carry the good Doctor's grey hair and mustache?