2. Children Of Earth
There is only one way to destroy a man who cannot stay dead, and that is to make him watch as his loved ones are killed off one by one. In the most shocking and gutwrenching Torchwood series ever, Jack can only stand and watch helplessly as he loses his friends, his lover (Ianto) and eventually his grandson to the 456 - losing his daughter in the process. The look on Jack's face as his daughter turns her back on him says it all; he's completely and utterly broken. He has nothing left besides Gwen. Torchwood is gone, all but one of his colleagues are dead; the one person he truly loved died before Jack could even tell him how he truly felt and now he has no family. Had he been able, I think that he would have taken John Frobisher's way out. In the final scenes, Jack meets with Rhys and a pregnant Gwen to say goodbye. Torchwood is hers now, if she wishes to keep it alive, but he no longer wants any part of it. He's done; finished. He uses his transporter device to leave Earth, not to be seen or heard from again until Ten finds him in the bar with Alonso in the closing scenes of End Of Time.