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Critic’s Corner: What’s on TV Friday

David M. Russell/SHOWTIME

Nurse Jackie  Sunday at 9 p.m., Showtime

It has been a really good, if not great, season of Edie Falco’s series, which has already been renewed. The tone was more comic than it had been while Jackie was still using drugs and deceiving her friends and family; there was very little of the intense drama that has defined the series so far. The finale on Sunday revolves around Jackie’s first sober anniversary. Will she stay sober? As always, Merritt Wever (left, with Falco) is irresistible as Zoey. By the way, Showtime has set up a silly blog for the character called “Zoey’s Nursing It Yo.”

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Shark Tank  8 p.m., ABC

After a slow start, with lousy ratings during its first season, “Shark Tank” has taken off for ABC. Maybe it’s the economy, and that audiences enjoy watching real people try to make it; maybe it’s just the cool ideas some of these ambitious entrepreneurs come up with. Anyhow, it’s an entertaining look at pitching, and it’s in repeats this summer if you missed the first run. In this episode, a toilet-training system for cats.

True Blood  Sunday at 9 p.m., HBO

The Billith Fair kicks off.

Mad Men  Sunday at 10 p.m., AMC

Oh Sally, poor Sally.

Zero Hour  Saturday at 8 p.m., ABC

Zero interest.

Matthew Gilbert can be reached at gilbert@globe.com. Follow him on Twitter @MatthewGilbert.
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