Riverdale

The CW, 7 p.m.

In “Chapter Eighty: Purgatorio,” after spending seven years away from Riverdale, Archie (KJ Apa) returns to find the town is now under Hiram Lodge’s (Mark Consuelos) grip and on the verge of becoming a ghost town. When Toni (Vanessa Morgan) catches him up on what’s been going on, Archie reaches out to the rest of the gang to return home.