Jack & other members of the Counter Terrorism Unit are chasing & sometimes being chased in this series
[DOC] [TLE] 24 Things to Recall Before 24: Live Another Day -- Vulture [PAR] May 5, 2014 ... After a four-year hiatus, Fox's action-thriller series 24 returns with ... After being 
tortured on Day 2, Jack developed a lasting heart condition.