Shannon Reese, thirtysomething patient, is able to teach Tom about her neighbors by using her ability to remove stress by listening to problems. Meanwhile, Tom is less than thrilled to learn that it seems like all residents of Evanston has been given Promicin.
The 4400 tells the stories of 4,400 people who disappeared over a period of fifty years and who all reappear at the exact same time without any memory of where they've been and what happened to them. Some of them have been altered and have strange abilities, both good and bad.
The series kicks off with a ball of light sailing toward Earth, but rather than the expected catastrophic event, thousands of people emerge from the ball of light. The returnees have been missing from a few years to several decades and no one has aged a day.