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With regards to the season itself, the first season had the tightest plot and seemed the most "realistic." While Jack certainly took some damage, he wasn't the superhuman he ended up being in later seasons (in one season his heart stops, he is shocked back to life and manages to kick terrorist ass for another eight or so hours). Season One also introduced some awesome surprise plot elements that became cliches in later seasons. While in later seasons the question became not if but who was the mole in CTU, throughout season one we are wrapped up in trying to figure out who exactly is out to get Jack. Season one also had one of the biggest finale shockers in TV history with (highlight for spoilers) the murder of Jack's wife by Nina Myers. Overall, season one of 24 is action-packed TV at its finest.