Charlize Theron: Aileen Wuornos (Monster)

This would probably be one of the most insane transformations in the history of biopics. The way Charlize changed herself to look like Aileen Wuornos in the famous movie Monster, it never gave an impression that an actor was performing someone else on the screen.

Instead, with the 30lbs of weight gain, shaved eyebrows, and freckled skin, Charlize did a commendable job to get a genuine appearance of Aileen. Of course, the actress was super impressive in the role, and she proved that she has a great sense when it comes to picking the right films.