5. Charlize Theron in Monster (2003)

Charlize Theron's transformation into serial killer Aileen Wuornos in Monster is both a physical and an emotional shocker. The actress underwent an astonishing physical transformation to play the part of the actual murderer, taking on prosthetics and weight. But it's Theron's emotional depth that really raises the performance—haunting humanity gives the audience empathy toward her tragic history. Raw vulnerability and single-minded commitment to earning her roles won Theron many accolades, including an Academy Award for Best Actress, which made her one of the most versatile actresses of her generation.
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