The season premiere finds Johnny still shaken by his Armageddon visions and growing increasingly obsessed with Stillson, whom he's secretly investigating. But another mystery draws him back into the public eye: a test of Johnny's powers by an adversary who is as obsessed with him as Johnny is with Stillson.

An unexpected incident leads Johnny to a profound new understanding of Walt.

A terrifying vision leads to Johnny's involvement with a man who suddenly disappears.

When Johnny is reunited with two close friends from high school, one of whom is awaiting a heart transplant, he is tormented by a vision of the other becoming the donor.