Every day, TVLine's What to Watch column spotlights new and returning English-language shows (and select movies) premiering or airing fresh episodes across broadcast, cable and streaming — organized below On TV this Thursday: "Leanne," "Adults," and "Beauty in Black" return with new seasons, and "Big Brother" celebrates a milestone. Season 2 premiere : Leanne and Carol are forced to step up in a big way when Margaret and John suffer a mishap at home; Jaime Pressly, Billy Gardell, Tyne Daly, and Lainey Wilson guest-star.

Season 20 finale : It's decision day and each couple must decide whether they'll stay married or get divorced. Then, the group reunites to rehash old drama and offer updates on where they stand today.

Limited series finale : Change is in the air as Chelsea looks back on all of her loves and losses, now finally ready to face the future and anything it may hold for her. For related coverage, explore our detailed analysis on Technology and Digital Systems.

Enterprise Falls Into Slipstream Updates

The Enterprise falls into a slipstream that pushes them to a catastrophic warp threshold; M'Benga is crushed under a biobed, leaving a lone Chapel to save her mentor. Season 3 premiere : Kimmie finally has a seat at the Bellarie table, but when a deadly family feud erupts, she's forced into an uneasy alliance with Mallory.

Season 2 premiere : Danny navigates the aftermath of a devastating Russian cyber-attack when an unexpected danger surfaces, forcing him to confront multiple crises simultaneously. The historic night looks back at some of the most memorable moments from the show's 26-year run, features surprise appearances from former Houseguests, and kicks off the biggest twist of the summer.

Read More: What to Watch: New Shows and Movies Premiering This Week

Top-ranked contestants — including Victoria Groce, Andrew He, Long Nguyen, Paolo Pasco, Yogesh Raut, and Juveria Zaheer — compete for the $500,000 grand prize in quarterfinal games five and six. Original housemates Deena Nicole Cortese, Paul "Pauly D" Delvecchio," Jenni "JWOWW" Farley, Vinny Guadagnino, Ronnie Ortiz-Magro, Nicole "Snooki" Polizzi, and Mike "The Situation" Sorrentino reunite for the Jersey Shore Roast.

Shannon Admits Financial Regrets Updates

Shannon admits financial regrets and turns to Vicki for guidance on getting her finances in order; the women get to know Camilla and her kids as they spend a day at her home. Season 2 premiere : Our five New York City twentysomething tackle a new set of real-world questions; Susie Essman, Raven-Symoné, Gaten Matarazzo, Jake Shane, Isaac Powell, Ben Marshall, and Zosia Mamet guest-star.

The breeding of genetically modified rare animals commands enormous prices; U.S. authorities uncover a vast trafficking network that entangles dealers and major zoo institutions. As Bert and Kripke team up, Stuart and Denise take a big step forward in a universe that looks and feels normal...

with one major difference. The Jokers are causing a scene on the street