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 through a series of inept partners, finally finds a way to cut through the red tape and get Tom back, all while in the midst of formally adopting Maia. Meanwhile, Richard, Lily and the baby are still living in meager conditions in a mountain cabin far away from Jordan. Jordan has now closed Arcadia Estates, and is on the verge of opening "The 4400 Centers," a place for non-members of the 4400 to discover "the 4400 within themselves." Collier becomes Shawn's guardian, and enlists him to heal important benefactors of the Centers.
Elenco: Joel Gretsch , Chad Faust , Billy Campbell , Conchita Campbell , Samantha Ferris , Mahershala Ali , Megalyn Echikunwoke , Patrick John Flueger , Jacqueline McKenzie , Jenni Baird , Kaj-Erik Eriksen , Karina Lombard , Kavan Smith , Laura Allen , Mahershalalhashbaz Ali , Megalyn Echikunwoke , Natasha Gregson Wagner , Peter Coyote , Rhonda Dent , Samantha Ferris , Summer Glau , Tristin Leffler .