I'm a fan of the Marvel Universe movies. I've been following the trilogies of Iron Man, Captain America, and Thor, plus of the Avengers. The other characters, not too much... until Benedict Cumberbatch's depiction of Doctor Strange finally got shown on the big screen.
I had no idea who Doctor Strange was. The movie showed that he's a big shot neurosurgeon who lost his ability to heal others because of a car accident. He traveled far and high to find a way to get his hands cured... all the way to Kamar-Taj, in the Himalayas. He learned to harness the power of mind-over-matter to the point that he was able to manipulate time and space. In the end, he was able to defeat the enemy but not through being 100% good. He stayed in the grey line between right and wrong to achieve his goals... just like the way the leader of the group did before she died.
What's interesting about Doctor Strange is that he, like the other Marvel Universe characters, aren't perfect. They have a dark side, which they keep struggling with. That actually is what they have in common with my favourite DC character: Batman.