Sheryl Nields/ABC Archive/Getty Images; Andrew Macpherson/ABC Archive/Getty Images
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Sydney, Vaughn and Lauren, Alias
After taking an eternity (OK, two seasons) to get together, Syd and Vaughn were promptly driven apart when she went missing for two years and he wed evil double agent Lauren. Luckily, Vaughn quickly came to his senses when Syd reemerged.