The Great Leap Forward (The 4400)

"The Great Leap Forward" is the thirteenth episode of season four of the science fiction television series The 4400 and the series finale. The episode aired on September 16, 2007 on the USA Network.

Synopsis

Seattle falls into chaos and NTAC is forced to look to Promise City for help. Meanwhile, Isabelle is ordered to murder Kyle Baldwin and Jordan attempts to escape from The Marked.

Due to the series' cancellation, this episode serves as the de facto series finale of The 4400.

Plot

Seen from Tom's point of view, Tom is put in a truck where Diana, Meghan, Marco and Shawn are. Marco injects Tom with Polonium, thus burning the nano-machines inside him and getting rid of the body snatcher, although it ultimately kills him. Shawn saves Tom by healing him. Tom still has all his memories from being marked and is upset after realizing he has killed people and done bad things. He tells Diana and Meghan that he has to go back to free Collier and that he is the only one who can do it because they don't know he is no longer marked.

Danny goes with his mom to the hospital and notices that people there begin to show the same symptoms and start dying, as if they had taken a promicin shot. Danny realizes that he has developed an ability to spread promicin like a virus, released in the air. Anyone who is around him is exposed to promicin even if they didn't take the shot. He...
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