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12. Starbuck/Kara Thrace (Katee Sackhoff, Battlestar Galactica)
Of all the tweaks made for the 2004 reboot of Battlestar Galactica, none was as controversial — or effective — as changing the gender of the embattled fleet's most fearless fighter pilot (played by Dirk Benedict in the 1970s series). The new Starbuck was an unforgettably bold handful: hard-drinking, authority-defying and reckless in her sexual and military exploits. Once seen in action, there was no doubt she was the best person for this high-risk, high-flying job.