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Sheldon takes acting lessons from Penny in hope of becoming a better teacher; Koothrappali fantasizes about his friend's girlfriend.

Mary gets Pastor Jeff involved when Sheldon isn't invited to Billy's birthday party; George Sr. has male bonding time with Dr. Sturgis.

Sheldon is shocked when a NASA representative at school dismisses his science; he becomes determined to prove him wrong.

Adam offers to make Murray a commercial starring Marvin, but Marvin's actions mess up the plan; Beverly helps Barry court a girl at school.

Phil pays a visit to his dad after hearing some concerning news about him; Jay gives Claire and Mitch a bunch of their old childhood memorabilia that triggers them to reevaluate a long-held story about their first family vacation.

A candid look at how the gossip site operates, bringing viewers into the site's newsroom, where the daily chats take place; viewers present their opinions on the featured topics through social media, phone calls and video chat.

A chair belonging to Abraham Lincoln comes into the shop; Corey and Chum check out a vintage Nintendo Donkey Kong arcade game; a signed Seinfeld script is brought in.

The coolest restorations in the history of the shop, including a samurai sword, a 1973 Jeep, a penny arcade Grip Tester, a 1930s tricycle, and a helicopter.

Looking at extreme winter storms.

Chris Pratt and Charlie Day ("The Super Mario Galaxy Movie"); Emily Rudd; Vince Vaughn; Heather Graham; filmmakers Phil Lord and Chris Miller; the cast of "You, Me & Tuscany"; Bradley Whitford; director Maggie Gyllenhaal ("The Bride"); Thandiwe Newton; K-pop group BTS.

Jack and Suzi explore Catalina Island, off the coast of California, and track down a herd of wild bison that have been living there since 1924; they also uncover bats roosting in an old barn, and meet the island's local veterinarian.

Jack and Sue head to Rwanda for an encounter with golden monkeys; getting a taste of the local fishing traditions; visiting a primary school.

Australia: koala; Tasmanian devil; a tour of the Australia Zoo with the Irwin family.

Florida: a turtle hospital rehabilitates the reptiles and releases them back into the wild; animal communication skills at the Dolphin Research Center.

Stay informed with the latest breaking news and headlines.

Stay informed with the latest breaking news and headlines.

Join financial planner Stewart Willis as he discusses strategies designed to protect and grow your nest egg.

Paid programming.

Barry Kripke expresses interest in Amy while leading a fencing lesson for the guys; when Stuart tries to attract female customers to the store, Penny, Amy and Bernadette help out.

Leonard and Sheldon go to great lengths to secure the helium they need during a nation-wide shortage; Bernadette and Penny try to find Amy a new man on a dating app.

Sheldon is shocked when a NASA representative at school dismisses his science; he becomes determined to prove him wrong.

Sheldon is forced to take a break from science when his new obsession with "The Lord of the Rings" leads to an unhealthy habit; Missy asks George Sr. to teach her how to play catch.

Paid programming.

Paid programming.

Chiropractor and single father Alan Harper lives in a beachfront house with divorced Internet billionaire Walden Schmidt, who bought the house following the untimely death of Alan's brother, Charlie. As they acclimate to their living arrangement, the tightly wound Alan finds himself taking on a mentor role with Walden, whose lifelong dependence on being taken care of has left him a bit naive. Desp

A pre-race lead-up to NASCAR racing.

From Sonoma Raceway in Sonoma, Calif.

Bernadette tries to negotiate peace between Sheldon and Wolowitz; Penny receives an embarrassing offer; Raj wants Amy to write to a woman on his behalf.

Sheldon is faced with a new reality when he visits his mom in Houston; a murder mystery party starts arguments.

Your only local, late-breaking news, weather and sports at 7pm.

Highlights from the fourth Republican Presidential debate, with expert analysis of the candidates and a breakdown of the night's top moments ahead of the primary election.

Documenting the life and career of the prolific actor through family photos, home movies and untold stories; includes interviews with the people who were closest to him.

Sheldon tries to convince Dr. Sturgis to return to the university; Georgie upsets the family when he makes a life-changing decision.

Meemaw opens a secret gambling room; Sheldon, Missy and Georgie adapt to new living arrangements.