Day 2: 5:00 P.M.-6:00 P.M. - S2-E10
Trivia: Fans have long speculated what Jack whispers to Nina in this episode. According to Kiefer Sutherland the scripted line was "I am going to hunt you down for as long as you live" but what he actually whispered was "I love you Sarah, why did you marry Xander?" Sarah is the name of the actress playing Nina and she is married to Xander Berkley who played George Mason. Apparently Sutherland whispered this to get a more interesting reaction from Nina.
Answer: According to Jack in season 5, Nina was "deep cover" before the pair ever met, so it's safe to assume she was recruited before she joined CTU. As for what her primary mission was, who knows? Perhaps it was to gather sensitive intel and pass it on to her superiors. Given that she worked for an intelligence agency, it's not a stretch. Or perhaps we may find out in season seven.
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