These people were of different ages and from different walks of life and not looking even a day older when they were last seen. It seems that these people are unaltered and untouched by time. It becomes apparent that many of them have developed special physical and psychic powers including Superman strength, healing touch and clairvoyance. The 4400 are eager to reunite with those they left behind. The 4400 shows what happened when two worlds collide and when 4400 people are forced to deal with the challenges of living in present and also what does it mean for those who will live with the returned people.