The 4400 Season Three

The New World
In a broadcast, the Nova Group promises the world a demonstration of their power on October 19. Tom and Diana apprehend Gary, but he refuses to give any information about October 19. Meanwhile, it's learned that Shawn has been funding the Nova Group for months, unaware of their murderous intent. Meanwhile, Shawn helps Isabelle deal with the guilt of her mother's impending death. Lily dies peacefully. Ryland and other government officials are on trial for withholding vital information that they discovered about the returnees when a disturbing sound is heard the courtroom. Tom and Diana, with the help of Gary Navarro, try and track down T.J Kim, who they believe is responsible for the piercing sound heard in the courtroom. Richard and Lily are forced to deal with a now grown Isabelle While Lily also suffers from a rapid aging disease that Shawn is unable to heal. Tom and Diana also investigate a radical organization called the Nova Group that appears to have ties with Shawn and the 4400 Center. Gary Navarro is arrested for the second attempt to assassinate Dennis Ryland. Knowing she is the key to her mother's survival, Isabelle attempts to kill herself by jumping off the 4400 center building only to survive without a scratch. Matthew Ross expresses his displeasure at her actions and tells her of the destiny she is to face. Isabelle is troubled about what Matthew told her, but after a discussion with Shawn she decides it's her choice with what she does with her life. Matthew gives Isabelle a substance that can kill her if it's injected.

Being Tom Baldwin
Tom Baldwin shoots T.J. in the head during interrogation....or did he? Tom is accused of murdering TJ Kim. 17 year old Boyd Gelder has the ability to change his appearance whenever he chooses. Meanwhile, Shawn and Isabelle grow closer.
Gone: Part 1
Tom and Diana must hunt down a kidnapper who targets 4400 children. Maia's sister, Sarah appears. Someone is targeting young 4400s and Maia gets kidnapped. A mistake from Shawn's past comes back to haunt him. Richard is given a position of authority at the 4400 Center.
Gone: Part 2
Tom and Diana track down the 4400 children kidnapper. Tom and Diana continue to investigate the disappearance of the 4400 children. Isabelle and Shawn's relationship becomes public.
Graduation Day
Daniel Armand of The Nova Group launches an attack against Shawn causing mental illness. Isabelle seeks retribution. Alana tracks down a drunk driver responsible for the death of her husband and child. Isabelle seeks revenge on the Nova Group after they attack Shawn. Alana confronts the man responsible for killing her husband and son in a car accident nine years ago.
The Home Front
Tom and Diana pursue the last member of the Nova Group, Gary Navarro but are foiled when he receives a tip off to escape capture. Alana is detained to explore suspected links to Nova Group. With the help of Dennis Ryland, NTAC track down the remaining members of the NOVA group. Nikki pays Shawn a visit.

Blink
Tom and Diana are drugged by a 4400 and are forced to face some unresolved issues from their past. Isabelle decides that Shawn should marry her. Tom and Diana are drugged with a hallucinogen, that was created from oil that was secreted from the hands of a 4400.
The Ballad of Kevin and Tess
Dr. Burkhoff continues his experiments on himself and forces them on another person and Maia has a nightmare where Diana looks like a monster. A rock star tries to involve Shawn in his health that demands almost all of his time. Kevin Burkoff becomes a marked man when his research on promicin is discovered. When Tom and Diana search for him, they discover how far he will go to protect his work. Shawn meets his idol at the 4400 Center.
The Starzl Mutation
A serial killer aims at people with a certain chromosome and Shawn gets a 4400 wedding cigar. Tom and Diana's investigation into a series of gruesome murders leads them to uncover another conspiracy within the government. At the 4400 Center, Shawn receives a gift from another returnee that allows him to see his future.
The Gospel According to Collier
Just as he's about to be wedded to Isabelle Shawn has seen Jordan Collier very alive and helps NTAC to search for him. April presents her new boyfriend to Diana, but soon after Maia tells Diana about a family enlargement. NTAC and the 4400 Center work together to find Jordan Collier. Kyle Baldwin gets a surprising visitor at the state prison.
Terrible Swift Sword
The Nova Group escapes from prison, so Hyland decides to develop his troops at the fastest and most ruthless possible. NOVA group members that were in the custody of NTAC escape from jail with outside help from Jordan Collier. Diana tells April about her relationship with Ben. Shawn and Richard learn that Isabelle is working with Dennis Ryland.
Fifty-Fifty
Jordan Collier's strategy is spread out 4400-anilities to everybody who wants them, and Devon is eager to be the first to try. Tom and Diana continue their investigation on Jordan Collier's plan for mankind. Dennis Ryland rejoins NTAC. Isabelle prepares for battle.