Doctor Strange

Stephen Strange is a brilliant and arrogant neurosurgeon that suffered a horrific car accident, and began a journey that led him to the discovery of magic and alternate dimensions.

Project Insight
Stephen Strange was among the targets being monitored as potential threats by HYDRA, along with Bruce Banner and Tony Stark as a part of Project Insight.

Behind the Scenes

 * Stephen Strange is mentioned in Captain America: The Winter Soldier. This marks the first time in the Marvel Cinematic Universe that a superhero character is mentioned by name before making their first appearance.
 * In a recent interview, Kevin Feige revealed that Strange likely does not have any powers yet during the events of Captain America: The Winter Soldier, as Project Insight was designed to anticipate future threats, not just catalogue current ones. He said, that, at this point Strange is "probably not... the sorcerer supreme," but is an "unbelievably talented neurosurgeon who's opinionated and kind of arrogant... [which] might put him on the list."