Kyle tries to visit his cousin Shawn at The 4400 Center but is thrown out. Richard and Lily are desperate to protect their infant daughter, Isabelle from Collier and other maniacs, and a schizophrenic 4400 wants a huge communicative device and makes it a hospital's project from a minor position.
A baseball player is overwhelmed by a special 4400 ability. Collier is involved with a weapons' dealer. To Maia's delight Diana's sister visits them. Richard and Lily seek shelter at a motel where Isabelle takes some surprising initiatives.
A salesman's saliva has an extremely slimming effect on people. Lily suspects a new pregnancy as Richard stumbles onto a case of jealousy. So does Collier, and Shawn is disgusted by his moral. Kyle is tempted to join a wild students' party. Maia finds her aunt's work very interesting.
Some schoolchildren get startling abilities and some parents suspect child abuse by a 4400 who is their teacher. Jordan Collier changes attitude, especially towards Isabelle and her parents. Shawn is fascinated by a young homeless girl.
Tom Baldwin wakes up in a parallel or alternate world where he has married a woman two years ago but he has never seen her before. There is no trace of any 4400s from the future with special skills, and Jordan Collier is Governor.
After living for 8 years in an alternate world that only Tom and Alana remember the world with the 4400 has returned as it was at the second the 8 years started. A 30 year old 4400 woman wakes up and finds everybody else in her local community dead. Maia puts April's love for her to a test.
A male 4400 originally from Rwanda repairs bad chromosomes of unborn. Kyle is utterly despaired as he suddenly remembers what he did during his blackout. Rishard attends a co-veteran's funeral. Diana takes s hard family decision.
On John Colliers'ø birthday NTAC receives threatening e-mails and gets attacked by terror. Kyle is concerned that an innocent will be convicted for killing Collier. Maia gets a mysterious infection and is treated at NTAC. Isabelle has broken off her special communication with her mother and transfers it to her father. At school a girl is very interested in Kyle.
7 of the 4400 have died and Maia gets worse all the time Out of suspicion and despair Diana threatens Dr. Hudson with a gun. Lily has run away with Isabelle and Richard pleads he to come back. Marsdem seems unable to avoid a long prison term which makes Alison contact Kyle.