Trivia: As initially conceived, the series was meant to be a family drama about the 24 hours that passed before a wedding, with each episode being in real-time. However, the creators worried that this idea wouldn't be exciting enough to hold an audience's attention. So they began to brainstorm other ways to use the real-time format idea they had come up with. They ultimately decided to change the series from a drama to an action-thriller, and thus "24" was born.
Trivia: The storyline of Teri's amnesia is loosely based on an incident that actually happened to series director Stephen Hopkins.
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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