The 4400 broke ratings records when it premiered and the sci-fi drama series continues to go from strength to strength, with the third season currently airing and a fourth commissioned. When 4400 missing people are returned all at once, apparently unchanged from the moments they vanished, the US government launches an investigation into the phenomenon. It gradually becomes clear that the 4400 have returned with strange new abilities, and that their presence will change the human race forever. This official in-depth companion to the first two seasons of the show is packed with behind-the-scenes interviews, exclusive pictures and a comprehensive episode guide.