

Another faction, which prefers the status quo, opposes the 4400, and has sent their own operatives, including Isabelle Tyler and "the Marked", into the past. The group is responsible for many terrorist attacks including the assassination of the men involved with the promicin-inhibitor conspiracy the attempted assassination of Ryland the framing of Baldwin for murder and the driving of another person to insanity.ĭuring the third and fourth season, it is revealed that only a certain faction from the future wants to see history changed. Originally formed as a "defensive" group in the aftermath of the promicin-inhibitor scandal, the Nova Group eventually carries out numerous terrorist attacks against the government and NTAC.

The inhibitor is ultimately removed from the 4400 by a dose of promicin extracted by Kevin Burkhoff from the blood of the infant Isabelle, who was never given the inhibitor.Īt the beginning of the third season, the Nova Group, a terrorist faction made up of 4400s, emerges. One of the inhibitor's side effects is a potentially fatal immune deficiency.

The government, afraid of what this large group would do with such power, had secretly been dosing all of the 4400 with a promicin inhibitor, which had worked on most, but not all, of the 4400. The first-season finale, " White Light", reveals that the 4400 were abducted not by aliens, but by humans from the Earth's future, that Kyle Baldwin was to be their "messenger", and that they were returned to avert a catastrophe.īy the second season, it is revealed that all 4400 have a fictional neurotransmitter, promicin, in their brains, which gives them their powers. In addition, one of the 4400, Lily Moore, has become pregnant between her disappearance and return. For example, in the pilot, Shawn Farrell manifests an ability to heal the broken neck of a dead bird, bringing it back to life. More significantly, a small number of the returnees begin to manifest paranormal abilities, such as telekinesis, telepathy and precognition, as well as other "gifts". Many of the returnees have trouble getting their lives back on track after being gone from the world for years. In the fourth season, Meghan Doyle takes over as the head of NTAC. In the second season, Ryland goes to Washington and is replaced by Nina Jarvis. Ryland assigns Tom Baldwin and Diana Skouris as the lead team to investigate the 4400. The National Threat Assessment Command (NTAC), a division of the Department of Homeland Security, is in charge of dealing with the return of the 4400.
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Confused and disoriented, they have no memories of what transpired prior to their return.Ĭreator Scott Peters has stated that the series was originally titled "A Light in the Sky", but looking for something unique he decided to "play around with numbers" instead and arrived at "4400" because it "just sounded cool" and "was a very round number with two 4s and two 0s". None of them have aged from the time of their disappearance.

Each of the 4400 had disappeared in a beam of white light in 1946 or after. In the series' pilot episode, a ball of light deposits a group of 4400 people in the Cascade Range foothills near Mount Rainier, Washington in the United States.
