Two acclaimed series wrap up Sunday, and happily for fans, both are assured of a new season. “The Good Wife” (8 p.m., CBS) finishes its fourth season with Zach certain he has evidence of vote rigging. This legal drama, set in Chicago (but shot in New York), has never been at the top of the ratings. But it has given CBS something it doesn’t get from its more popular shows: critical acclaim, prestige and a positive buzz from the chattering class. “NCIS” may get more than 20 million viewers, but cutting edge it is not. CBS has long maintained that it’s not in the business of collecting Emmys, but it’s nice to have at least one show that gets some respect.

Meanwhile, over on History, popularity has never been a problem for “Vikings” (9 p.m.), wrapping up its first season with the village of Kattegat facing a plague. History has picked up a second season of this series, the most popular new cable drama of the year.

For all of its violence, “Vikings” is a family show at heart. Its compelling hero, Ragnar Lothbrok (Travis Fimmel), is not merely an intrepid explorer, adventurer and military leader, but a loyal husband and a wise and patient father. And it’s been interesting to watch him take on the injustice and capricious cruelty of his nemesis Earl Haraldson (Gabriel Byrne) in the context of his role as a family man. In many dramas, the hero is a single young man or an older stranger with a sad or mysterious past. Ragnar’s bold actions are all the more exciting because he has so much more to lose.

Sunday’s highlights

• Scheduled on “60 Minutes” (6 p.m., CBS): Serial killer nurse Charles Cullen; female jockey Rosie Napravnik.

• Hook helps Regina with her scheme on “Once Upon a Time” (7 p.m., ABC).

• It’s time for No. 4 (Tom Baker) on “Doctor Who: The Doctors Revisited” (7 p.m., BBC America).

• Grove steps in for Harry on part five of “Mr. Selfridge” on “Masterpiece Classic” (8 p.m., PBS, check local listings).

• The Hound faces judgment on “Game of Thrones” (8 p.m., HBO).

• Selina demands face time at a military event on “Veep” (9 p.m., HBO).

• Marta discovers painful truths about her family on “Red Widow” (9 p.m., ABC).