Day 5: 3:00 AM - 4:00 AM - S5-E21
Audio problem: In the scene where the President Logan is in his office and planning to take his own life, he gets a phone call from CTU's Miles Papazian. When President Logan answers the intercom, his voice sounds like he is the one talking through the intercom, eventhough the camera stays on President Logan. After answering the intercom, his voice changes back to normal.
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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