Jack is able to travel instantaneously to any location where he's needed when it would take an hour or more to travel there by car or plane. His messenger bag, which has the demonstrated ability to produce any weapon or utility that he needs for a given task, is a TARDIS. Jack has never been seen to use his TARDIS to travel back in time or to other planets; it's probable that he was exiled to Earth by the Council, much like the Third Doctor, and his TARDIS is not fully functional. Time Lords have two hearts, which is why he was able to survive cardiac arrest in season 2 and season 4, though his avoiding regeneration those times was baffling. And Jack is a demonstrated polymath with skills in multiple military and intelligence disciplines, and he is able to fly a helicopter and defuse nucle