Recurring characters include Gary Navarro (Sharif Atkins), who joins the Nova Group, Dr. Burkoff (Jeffrey Combs), who injects himself with promicin--the mysterious substance associated with the 4400--and the sympathetic Tess (Summer Glau), who assists in his attempt to see if he can develop similar powers. Guest stars include Alice Krige (Star Trek: First Contact) as a woman with a special interest in Diana's adopted daughter Maia ("Gone") and Brian Dennehy (Cocoon) as Tom's father ("Blink"). As with season two, three features commentary from the cast and crew plus a trio of featurettes. --Kathleen C. Fennessy