1. PILOT
Everyone on Earth is excited about a comet passing by, but as soon as its trajectory changes to a collision course everyone starts to panic. The comet turns out to be a giant ball of light that when explodes it leaves behind 4400 people. They are missing persons who have been gone from a few months to 60 years and none have aged a day. The 4400 are put in quarantine and eventually released. Some of the returnees begin to exhibit strange and uncontrollable new abilities. Tom Bishop and Diana Skouris, two Homeland Security agents, are appointed to find out what happened to the 4400.
2. THE NEW AND IMPROVED CARL MORRISSEY
Carl Morrissey is a lowlife supermarket employee who happens to be one of the 4400 returned abductees. He uses his new found powers - enhanced reflexes and strength - to become a vigilante and fight crime in his neighborhood.