( 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 wo n'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 does n't know exists .
The ` moms from ` ` ` ` Theory '' guest star this week . ` ` Backstrom , '' ` ` Blue ` '' are among the show 's biggest finales . Comedy ` ` Younger '' is gaining big buzz .