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Sheldon, Dr. Linkletter and Meemaw team up on a science experiment; Mary is jealous that Pastor Jeff and Brenda are spending time together; Georgie has a new side hustle.

Meemaw is forced to take the church shuttle while her car is in the shop.

When the IRS accuses Sheldon of making a mistake, he'll stop at nothing to prove them wrong; Dale is forced to get a colonoscopy and tries to convince Meemaw to join him.

Sheldon finds himself at odds with Paige when she considers enrolling at East Texas Tech.; Mary seeks June's advice when looking for a change.

The Coopers discuss the possibilities of black holes and alternate universes when Dr. Sturgis comes over for dinner.

Missy's first disappointment in love triggers a series of events that leads the Cooper family to the edge of an abyss.

Soldiers and civilians travel to the year 2051 to join a global war against a deadly alien species.

Dylan and Luke are really impressed with Bill's tales of heroism and survival as a firefighter, which make Phil feel emasculated.

In an effort to be less negative, Claire inadvertently approves of Luke's new relationship with someone from his work; Phil tries to surprise Alex at school right before she receives an award she didn't tell him about.

Sheldon and Missy both run away from home together; Mary gets some upsetting news about her husband, George.

Sheldon encourages Missy to question the Bible; Meemaw is determined to catch George Sr. in a lie; Mary helps Pastor Jeff search for a youth pastor.

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

Phoebe's ex-singing partner wants to make Phoebe's signature song, "Smelly Cat," a commercial success; Chandler dates a woman with a handicap.

Phoebe can't communicate with her new boyfriend, a UN diplomat who doesn't speak English; Ross seeks solace at a party after a bitter fight with Rachel.

A remorseful Ross tries to prevent Rachel from learning his disturbing secret; Monica, Phoebe, Chandler and Joey spend a night eavesdropping.

Excluded from Rachel's ski trip with her pals, lonely Ross visits his ex-wife (Jane Sibbett); Phoebe's cab runs out of gas and the stranded gang turns to Ross for help.

Phoebe's brother wants to marry a woman twice his age; Monica gets a huge tip from an admirer.

Ross is upset when Rachel returns his personal belongings and dates Mark; Monica dates a millionaire.

Monica's aunt dies and leaves her an antique dollhouse that she doesn't want Phoebe to play with; Rachel regrets making a date for Chandler and her boss, Joanna; Joey's interest in Kate intensifies.

Monica considers accepting a dream job in Pete's new restaurant but fears there is more to the deal; Ross makes a sacrifice for Rachel.

The gang goes to the opening night of Joey's plays; Rachel brings a date (Ben Stiller) to make Ross jealous; Joey's play gets terrible reviews, but his co-star provides some comfort.

Afflicted with a mysterious skin condition, Ross seeks advice from Guru Saj; Monica can't decide about Pete.

To her horror, Monica's boyfriend plans to fight; the friends are intrigued by a conversation between two strangers.

The friends stay at a beach house; Phoebe meets someone who knows details about her family; Rachel expresses her jealousy of Ross' uninhibited girlfriend.

When Wolowitz dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny's Halloween party; Leonard is shocked when Penny doesn't remember their first kiss.

Leonard is caught between a rock and a hard place when he becomes responsible for distributing extra grant money; Bernadette turns the backyard playhouse into a hideaway to get away from her husband and kids.

Adam Lefkoe, Bruce Pearl, Jamal Mashburn, Jalen Rose, and Seth Davis preview the upcoming NCAA Tournament games.

The Alabama Crimson Tide and the Michigan Wolverines battle in a crucial Sweet 16 contest today. This thrilling tournament brings the postseason tension directly to the hardwood at the United Center. The Wolverines boast overall shooting efficiency.

The Tennessee Volunteers and the Iowa State Cyclones battle in an intense Sweet 16 showdown today. This pivotal college basketball matchup brings the atmosphere directly to the floor at the United Center. The Volunteers dominate the offensive boards.

Adam Lefkoe, Bruce Pearl, Jamal Mashburn, Jalen Rose, and Seth Davis recap all the NCAA Tournament action.