In our continuing countdown to -- sniff, sniff -- the '24' series finale on May 24 (8M ET, Fox), here's a our list of the all-time most villainous Jack Bauer foes.
(Played by Sarah Clarke)
'24' seasons: 1-3
Why she's one of the bad guys: She was the first big traitorous villain in the series, betraying her co-workers and friends, committing numerous murders, dealing in biological weaponry and devastating every member of Jack Bauer's family.
Most evil moment: Killing Teri Bauer at the end of season one. True, it was the moment that defined '24' as the show that was going to go beyond the limits of what we were used to expecting from TV dramas. But it was also incredibly cruel. Nina had already betrayed Jack and Tony (both of whom she had also had affairs with), CTU and her country, and after the brutal day Teri had already suffered, it was tragic that she and Jack's unborn baby wouldn't survive it.
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