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.
Gastrollen:
Billy Campbell(Jordan Collier), Kavan Smith(Agent Garrity), Jeffrey Combs(Kevin Burkhardt), Richard Kahan(Marco Pacella), Summer Glau(Tess Doerner), Rob LaBelle, Charles Napier(Josiah), Hiro Kanagawa, Julian Christopher, Bill Mondy(Agent Hubbard), Michael Ryan(David Sumlin), Patricia Harras(Carol Sumlin), Avery Tiplady(Peter Sumlin), Jason Griffith(Arlo), Sean Tyson(Gabriel), Clint Carleton(Owen), Dawn Chubai(Newscaster), Chelah Horsdal(Jeanine), Graeme Duffy(Brady Wingate), Sean Devine(P.J.), Lisa Marie Caruk(Gwen), Nick Misura(Store Owner), Darryl Quon(Orderly), Winnie Hung(Sick Woman), Trevor Roberts(Mechanic), Noah Beggs(Mechanic)