article: (CNN)Two of the best actresses on television are back on "The Big Bang Theory" -- one of our six suggested things to watch this week. 1. "The Big Bang Theory," Thursday 8 p.m. ET, CBS . Sheldon and Leonard's moms are back, and that ought to make for one of the best episodes this season. TV's top comedy will see the return of Christine Baranski and Laurie Metcalf as the mothers of Leonard and Sheldon, respectively. Seeing as they're two of the most talented actresses on television, we should be in for a great episode, as the pair drive their sons crazy. 2. "Saturday Night Live," Saturday May 2 at 11:30 p.m., NBC . Scarlett Johannsson is the host, the day after her new blockbuster "Avengers" movie opens nationwide. 3. "Mom," Thursday 9:30 p.m., CBS . Allison Janney continues to deliver Emmy-worthy performances in this underrated Chuck Lorre dramedy. The season finale is this week. 4. "Backstrom," Thursday 9 p.m., Fox . Time will tell if the Rainn Wilson crime drama comes back in the fall, but fans of the quirky series won't want to miss the season finale. 5. "Blue Bloods," Friday 10 p.m., CBS . The Tom Selleck drama concludes its two-part season finale, although its future is in question. 6. "Younger," Tuesday 10 p.m., TV Land . This charming comedy from the creator of "Sex and the City" just got picked up for a second season. Now is a great time to tune in as Sutton Foster and Hilary Duff deal with a secret generation gap that one of them doesn't know exists.
highlights: The two moms from "Big Bang Theory" guest star this week .
  "Backstrom," "Blue Bloods" are among the week's season finales .
  Comedy "Younger" is gaining big buzz .
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   this season 
   the return of Christine Baranski and Laurie Metcalf 
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