Fans of the wildly popular British sci-fi series "Doctor Who" are already familiar with Scottish actress Karen Gillan, but she made instant headlines in the U.S. after showing up to the 2013 San Diego Comic Con with a completely bald head. Why did she do it? The 26-year-old fully committed to her role in 2014's highly anticipated Marvel heroes epic "Guardians of the Galaxy," and shaved it all off for her role as alien villainess Nebula. —XFINITY Entertainment Staff (Photo: Michael Kovac/Getty)
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