On “The Comeback,” AI gets the last laugh

Over three seasons set in three different decades, “The Comeback” has been guided by the constant, evergreen punchline of Lisa Kudrow’s Valerie Cherish not quite getting what’s happening to her career. The first season, in 2005, follows her return to TV on a bland network sitcom called “Room and Bored.” Season 2 returned nine years later to wrestle with Peak TV’s onslaught.

For its third and final season, “The Comeback” finds Valerie a project in which she’s the star and an executive producer.