Tonight, SEASON PREMIERE, 10 p.m. ET (FX)
Why You Should Watch: Season 4 of the horror epic opens with “The Worm Turns,” set in the aftermath of a nuclear war. Eternal Night has fallen, and Eph (Corey Stoll), completely devastated by the atrocities his own son committed, has fled New York in favor of Philadelphia. There, he finds new fighters who are able to rekindle his passion to resist. Elsewhere, Fet and Quinlan (Kevin Durand, Rupert Penry-Jones) search for a new means of stopping the Master.