 | 1x01 Pilot (The Return) (Air Date: Jul. 11, 2004)
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 ... |  | 1x02 The New & Improved Carl Morrissey (Air Date: Jul. 18, 2004)
Carl Morrissey is a lowly 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 ... |  | 1x03 Becoming (Air Date: Jul. 25, 2004)
Tom and Diana are sent out to investigate a homicide that resembles the MO of a serial killer who was never caught nor heard of for 25 years. The first suspect is Oliver Knox, a member of ... |  | 1x04 Trial By Fire (Air Date: Aug. 01, 2004)
The 4400 are attacked by a series of fire-bombings after Barbara Yates made their names and addresses known to the public. Tom, Diana, and Ryland try to put an end to the bombings at the ... |  | 1x05 White Light (Air Date: Aug. 08, 2004)
Tom is furious upon finding out that Lyttel took his son Kyle into custody. Diana offers him help in getting Kyle back. Meanwhile, Richard suspects that Collier is trying to take control ... |
 | 2x01 Wake-Up Call (1) (Air Date: Jun. 05, 2005)
It's been one year since the 4400 returned. After a period of intense medical observation, Tom has returned to NTAC in a limited capacity, assigned only to desk duty. Diana, having been ... |  | 2x02 Wake-Up Call (2) (Air Date: Jun. 05, 2005)
It's been one year since the 4400 returned. After a period of intense medical observation, Tom has returned to NTAC in a limited capacity, assigned only to desk duty. Diana, having been ... |  | 2x03 Voices Carry (Air Date: Jun. 12, 2005)
Gary Navarro, a minor league baseball player back after a 30-year absence, finds that hearing everyone's unspoken thoughts is driving him to the edge of madness. When he seeks help from ... |  | 2x04 Weight Of The World (Air Date: Jun. 19, 2005)
Someone puts his 4400 ability up for auction, and the Supreme Court will have a special session to determine if it's legal and if the auction can continue. Diana and Tom are ordered to investigate. ... |  | 2x05 Suffer The Children (Air Date: Jun. 26, 2005)
A schoolteacher terrifies parents with her supernatural ability to inspire artistic students. Meanwhile, Richard and Lily are confronted by police, and Jordan warns Shawn not to overuse ... |  | 2x06 As Fate Would Have It (Air Date: Jul. 10, 2005)
Maia's morbid premonition threatens the fate of Jordan Collier. Kyle's frightening blackouts are disrupting Tom's personal life. Diana is asked to hand over Maia's diary to NTAC. |  | 2x07 Life Interrupted (Air Date: Jul. 17, 2005)
Tom and Diana track down a man to a museum, and during the chase, Tom finds a mysterious lab that only he can see. Later at the office, Tom finds that all his 4400 case files are gone, and ... |  | 2x08 Carrier (Air Date: Jul. 24, 2005)
Tom and Diana investigate a 4400 who has released a plague that's wiped out an entire town's population, and her powers could wipe out humanity. Meanwhile, a Washington D.C. lobbyist joins ... |  | 2x09 Rebirth (Air Date: Jul. 31, 2005)
Tom and Diana investigate a 4400 whose ability is to heal damaged fetal chromosomes while in utero. |  | 2x10 Hidden (Air Date: Aug. 07, 2005)
NTAC follows a series of clues which leading them to Jordan Collier's killer, and when Tom discovers Kyle was the murderer, he must choose between the law and his family. Meanwhile, at the ... |  | 2x11 Lockdown (Air Date: Aug. 14, 2005)
On Jordan Collier's birthday, an unknown 4400 releases a "rage bomb" at NTAC, causing all the male agents to revert to their primal instincts. In order to stop the spread of the behavior, ... |  | 2x12 The Fifth Page (1) (Air Date: Aug. 21, 2005)
As members of the 4400 around the world all develop serious illnesses, Tom and Diana are led into a sinister conspiracy. |  | 2x13 Mommy's Bosses (2) (Air Date: Aug. 28, 2005)
On the heels of discovering that NTAC is behind the disease plaguing the 4400, Tom and Diana find themselves enveloped in a government conspiracy to hide the truth. Although the disease ... |
 | 3x01 The New World (1) (Air Date: Jun. 11, 2006)
Isabelle suddenly ages into womanhood, and Richard is horrified to learn that the effect has caused Lily to become an old woman. Meanwhile, T.J. Kim, now a member of the terrorist Nova Group, ... |  | 3x02 The New World (2) (Air Date: Jun. 11, 2006)
Isabelle suddenly ages into womanhood, and Richard is horrified to learn that the effect has caused Lily to become an old woman. Meanwhile, T.J. Kim, now a member of the terrorist Nova Group, ... |  | 3x03 Being Tom Baldwin (Air Date: Jun. 18, 2006)
A shape-shifting member of the Nova Group kills T.J. Kim while in the guise of Tom. Meanwhile, Shawn helps Isabelle to achieve rites of passage that she missed. |  | 3x04 Gone (1) (Air Date: Jun. 25, 2006)
Maia, along with other 4400 children, is kidnapped, forcing Diana to look through Maia's diaries for clues. Meanwhile, Richard, after learning that Shawn donated money to the Nova Group, ... |  | 3x05 Gone (2) (Air Date: Jul. 02, 2006)
Although all evidence and memories of Maia, as well as other 4400 children, have been wiped from existence, Tom and Diana have recurring thoughts of her. With Alana's help, Diana manages ... |  | 3x06 Graduation Day (Air Date: Jul. 09, 2006)
As Isabelle retaliates against the Nova Group for attacking Shawn, Alana learns the identity of the drunk driver that killed her husband and son. |  | 3x07 The Home Front (Air Date: Jul. 16, 2006)
NTAC finally locates Gary Navarro, but someone at the 4400 Center tips him off before they can catch him. Meanwhile, Nikki Hudson visits Shawn and asks that he heal her father, who has cancer. ... |  | 3x08 Blink (Air Date: Jul. 23, 2006)
Tom and Diana are drugged with a hallucinogen, created by a 4400, that causes them to confront significant people from their pasts. |  | 3x09 The Ballad Of Kevin & Tess (Air Date: Jul. 30, 2006)
Kevin runs for his life when he becomes a marked man because of his promicin research; and as Tom and Diana search for him, they discover the depths of his devotion to his work. Also, Shawn ... |  | 3x10 The Starzl Mutation (Air Date: Aug. 06, 2006)
As a wedding present, a 4400 gives Shawn a cigar that will allow him to see the future. Shawn uses it but has visions of the gruesome results of both marrying and not marrying Isabelle. ... |  | 3x11 The Gospel According To Collier (Air Date: Aug. 13, 2006)
Hoping to get Kyle freed from prison, Tom searches for Jordan Collier to prove that he is still alive. Meanwhile, Diana's sister April returns and reveals that she is moving to Seattle with ... |  | 3x12 Terrible Swift Sword (Air Date: Aug. 20, 2006)
At the 4400 Center, Jordan gives a press conference about his “resurrection” and a war between good and evil that supposedly already began. Tess and Kevin are still fugitives at large ... |  | 3x13 Fifty-Fifty (Air Date: Aug. 27, 2006)
Through an online video, Devon reveals to the world that she is going to start injecting herself with Promicin and that it will be available to the public soon. However, her body later rejects ... |
 | 4x01 The Wrath of Graham (Air Date: Jun. 17, 2007)
Months after the season 3 finale, a student develops a unique ability after taking a Promicin injection. Diana hunts for her sister while Tom heads to the jail to visit Isabelle. After some ... |  | 4x02 Fear Itself (Air Date: Jun. 24, 2007)
People begin to see their greatest fears -- from tarantulas to walls closing in -- leading Tom and Diana to look for someone with the ability to make people see only their worst fear. Their ... |  | 4x03 Audrey Parker's Come and Gone (Air Date: Jul. 01, 2007)
An elderly woman develops the ability to astral project while remaining unseen after taking Promicin. But when her body is murdered, the woman is stuck in limbo and must find a way to contact ... |  | 4x04 The Truth and Nothing But The Truth (Air Date: Jul. 08, 2007)
Diana finds her sister, April, who has developed an ability that puts Diana in danger. Meanwhile, Shawn is asked to run for office and Kyle protects Isabelle. |  | 4x05 Try The Pie (Air Date: Jul. 15, 2007)
Shannon Reese, thirtysomething patient, is able to teach Tom about her neighbors by using her ability to remove stress by listening to problems. Meanwhile, Tom is less than thrilled to learn ... |  | 4x06 The Marked (Air Date: Jul. 22, 2007)
Diana and Tom watch a black and white movie about JFK's assassination. Of course, they have a reason for watching this and that is because 4400 Curtis Peck made the movie. Neal, one of the ... |  | 4x07 Till We Have Built Jerusalem (Air Date: Jul. 29, 2007)
Tom and Diana are concerned when a Delta Force team composed of enhanced soldiers is ordered to capture Jordan, dead or alive. Maia has a vision of the team killing Jordan and what follows ... |  | 4x08 No Exit (Air Date: Aug. 05, 2007)
A mysterious lockdown at NTAC traps everyone, including Collier and his group, forcing an unlikely alliance. |  | 4x09 Daddy's Little Girl (Air Date: Aug. 12, 2007)
Richard, hoping to start over, kidnaps Isabelle. Meanwhile, Tess takes over a diner, forcing Shawn to intervene. |  | 4x10 One of Us (Air Date: Aug. 19, 2007)
Tom finds it hard to continue on the search for Richard Tyler because of chronic dreams about the future he's been having. Later, Richard, who is hiding with Isabelle, is visited by his ... |  | 4x11 Ghost in the Machine (Air Date: Aug. 26, 2007)
Tom and Diana are in a race against time to find the source of a computer virus that is threatening Ubient software, one of the largest software companies in the world. Meanwhile, Maia heads ... |  | 4x12 Tiny Machines (Air Date: Sep. 09, 2007)
Meghan and Diana learn how to remove the entity from Tom, but the procedure is dangerous. Meanwhile, Shawn finds help in his attempt to rescue Kevin from Promise City; and Jordan is betrayed ... |  | 4x13 The Great Leap Forward (Air Date: Sep. 16, 2007)
Season 4 ends with Seattle in chaos and NTAC asking Promise City for help. Meanwhile, Kyle's life is in danger and Jordan attempts to escape from the Marked. |
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