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Season 8, Episode 4

Episode Title: Day 8: 7:00 P.M.-8:00 P.M.

Air Date: 2010-01-18

Overview:

While the newly-upgraded CTU is challenged by some unexpected and complicated circumstances, Jack Bauer becomes even more involved in preventing an upcoming assassination attempt on Omar Hassan, a visiting President. Meanwhile, international security is jeopardized by an explosive event, and Jack is reunited with agent Renee Walker.