At the end of season 5 Jack was carted off to China to pay for what he did to their counclet in season 4. This was a fantastic chance to bring an entire new concept to 24. I expected Jack to be fighting to get free, proberbly with a gfroup of Covert CTU agents. Sad;y, the writer's weren't willing to take the risk so Jack is brought back to L.A with little explanation in order to be part of a swap which would stop terrorists from exploding more bombs across the country. Of course, alot of stuff happens and eventuelly Jack is back fighting the nuclear-bomb carrying terrorists.
Its proberbly the worst season for plot, I mean i don't expect any credibility to the plot, all of them have been beyond belief, but this just repeats many of the things that all the other seasons have done (though on a good note, this is the first season not to have a mole inside CTU).
But what it lacks in originality, it makes up for with presenting blistering action, fantastic acting (Peter MacNicol is fantastic as Tom Lennox, proberbly my favorite political character the show has had - yes even better than David Palmer) and a whole host of classic 24 moments.
So yes it is waeker in originality, but looking at the trailer for season 7, thats gonna change, infact you go to youtube right now and watch it. Yes it looks stupidly unplausible, but hasn't most of the show been like that. Whatever people say about it 24 is still the best show on telly and though most of this season is a little weak compared to the others, its worth watching for a final scene that is proberbly one of the best moments of drama ever put on the small screen!!!!!!