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The National Threat Assessment Command (NTAC), a division of the Department of Homeland Security, is in charge of dealing with the return of the 4400. The primary agents assigned to the cases of investigating the 4400 are Tom Baldwin and Diana Skouris, as well as their immediate superior for season one, Dennis Ryland . In seasons 2–3, Ryland is replaced by Nina Jarvis and theory room consultant Marco Pacella, with Ryland becoming a recurring character. Season 4 sees Jarvis replaced by Meghan Doyle.

Personnel[edit | edit source]

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