1: Pilot
4400 people, assumed to be dead or missing over the past sixty years, reappear with no memories of where they were taken.

2: The New & Improved Carl Morrissey
Tom and Diana investigate a 4400 who has used his ability of enhanced reflexes to become a vigilante.

3: Becoming
Tom and Diana investigate Oliver Knox, a 4400 suspected of being a serial murderer.

4: Trial By Fire
The 4400 are targeted by a group of fanatics. NTAC races against time to prevent the deaths of any 4400.

5: White Light
Diana helps Tom break Kyle out of NTAC quarantine, eventually leading them to discover the truth behind the 4400.

6: Wake-Up Call (2 Hour Special Season Premiere)
Tom and Diana investigate a mysterious structure being built at a psychiatric hospital, based on the drawings of one of their patients who's a 4400.

8: Voices Carry
A returnee exhibiting telepathic abilities seeks help from NTAC. But he is used as a means to infiltrate Jordan Collier's 4400 Center.

9: Weight Of The World
Tom and Diana investigate a 4400 who has the ability to increase the human bodies' metabolism. Could this be the answer to the weight-conscious world as the ultimate fat-burner?

10: Suffer The Children
Tom and Diana investigate a 4400 junior high school teacher who is accused of child abuse.

11: As Fate Would Have It
A predicition from Maia threatens the future of the 4400 Center.

12: Life Interrupted
Tom finds himself in a world where the 4400 never happened.

13: Carrier
A 4400 whose ability has turned her into a walking plague believes she is the next messiah.

14: Rebirth
Tom and Diana investigate a 4400 with the ability to repair birth defects in unborn children.

15: Hidden
NTAC and Tom enter a race against time as they both draw closer to Jordan Collier's assassin.

16: Lockdown
NTAC goes into an emergency lockdown when a 4400 launches a terrorist attack.

17: The Fifth Page
4400s all across the globe are developing a strange, severe illnesses, leading Agents Baldwin and Skouris into the heart of a terrifying conspiracy.

18: Mommy's Bosses (Season Finale)
Tom and Diana find the source of the plague afflicting the 4400, a discovery that will ultimately change their lives.

19: The New World (Season Premiere)
Richard must contend with profound changes in both his wife and daughter, while Tom and Diana track down a radical 4400 organization called the Nova Group.

20: Being Tom Bladwin
It's an ordinary morning for Tom Baldwin, that is until NTAC shows up to arrest him for a crime he can't remember committing. Is Tom losing his grip on reality, or is someone setting up?

21: Gone, Part I
Tom and Diana race to find a kidnapper targeting 4400 children as Shawn learns that a mistake from his past could have deadly consequences.

22: Gone, Part II
Tom and Diana continue their pursuit of a kidnapper targeting 4400 children.

23: Graduation Day
The Nova Group launches an attack against Shawn causing Isabelle to seek retribution.

24: The Home Front
Tom and Diana pursue the Nova group member Gary Navarro.

25: Blink
Tom and Diana literally come face to face with their pasts when they are dosed with a drug created by a 4400.

26: The Ballad of Kevin and Tess
Kevin Burkhoff is forced to go on the run in order to protect his promicin research.

27: The Starzl Mutation
Tom and Diana's investigation into a series of bizarre and grizzly murders leads to them uncovering a shocking conspiracy. 

28: The Gospel According to Collier
A sighting of Jordan Collier, thought to be dead, leads to a manhunt.

29: Terrible Swift Sword
An investigation into the escape of Nova members from NTAC custody leads Tom and Diana to suspect Jordan Collier.

30: Fifty Fifty
Tom and Diana race to stop Jordan Collier, whose plan to save the future could through the world into chaos.