Captain America - Civil War: 10 Characters Martin Freeman Could Be Playing

10. Baron Mordo

As proven with his brilliantly slimy performance in Fargo, Freeman can work very well against type. That he comes across as a bumbling, charming everyman only makes his eventual reveal as a dark villain all the more effective. Keep that in mind, because that argument might pop up a few more times.

Baron Karl Mordo is Doctor Strange’s mystical rival, and the previous student of Strange's teacher. He ventured into the world of black magic and seeks nothing but power and the destruction of Strange. The appeal of Mordo is that it would re-unite Freeman with his Sherlock co-star Benedict Cumberbatch. 

Their chemistry is the biggest appeal of that show and having them square off can be immensely satisfying, as proven in The Hobbit: The Desolation of Smaug.

Mordo might seem a bit out of place in an already-crowded film that will likely have little to do with magic, and better suited to be played by someone like Mads Mikkelsen. Yet, Marvel loves to set up and interconnect their movies, and what better way to set up Doctor Strange than to first introduce us to his greatest foe. Mordo could be subtly influencing and manipulating from the sidelines, or perhaps emerging at the end amidst the chaos.