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Randy looks back at his favourite appointments, including a Boston Marathon bombing survivor. And, a US Air Force veteran receives VIP treatment.

Molly decides to take a break from writing her novel and accepts a job as a forklift driver at Vince's warehouse - with mixed results.

Molly is determined to get Mike out of his routine. They try new things together, until reality sets in and it's time to pay the bill.

Following a dramatic argument with Joyce over money, Mike and Molly move into Mike's childhood room at Peggy's.

The Geezer Bus And A New Model. Sheldon refuses to ride in a car after getting into an accident with Meemaw. Meemaw is forced to take the church shuttle.

When the IRS accuses Sheldon of making a mistake, he stops at nothing to prove them wrong. Meanwhile, Dale is forced to get a colonoscopy.

Sheldon faces consequences after installing a pirated computer game. Mary and Meemaw take Brenda out for Girls Night, and George watches Billy.

Feeling his baby kick sends Howard on a baby-items buying binge with Raj, Sheldon and Amy host a brunch, and Penny is invited to a sci-fi convention.

Amy fibs about repairs being made to her apartment. Later, they present a episode of 'Fun with Flags' in Penny's apartment.

A successful gene experiment leaves Sheldon excited to procreate with Amy. Raj is reluctant to reveal what his new woman does for a living.

A coworker's MacArthur Genius fellowship award leaves Sheldon stone cold jealous. Howard finds a remote-control Stephen Hawking action figure.

A divide develops between Sheldon and Leonard when divvying up their shared belongings. Raj and Stuart battle to provide Bernadette the most help.

While Sheldon and Amy celebrate Amy's birthday, Howard and Bernadette welcome their new Baby Wolowitz.

Sheldon and Amy visit Leonard and Penny for the first time since the holidays and share details about their terrible trip to Texas.

After a disagreement, Penny takes off for a spa weekend, and Sheldon plays peacemaker. Howard and Raj battle a noisy floor in the baby's room.

Mike asks Carl to replace him as Molly's dance partner at a salsa class but gets jealous when he realises they're having way too much fun.

Molly grudgingly goes to a therapist at Mike's urging.

A confident Molly offers her wisdom to Samuel who now wants to be a standup comic. Her advice causes him to challenge his protective mother.

Sheldon is at odds with Paige once again when she considers enrolling at East Texas Tech. Mary seeks the advice of June 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 heartbreak triggers a series of events that lead the Cooper family to the brink.

Sheldon tests an MIT invention, Leonard has trouble when Penny announces her brother's visit, and Raj seeks advice from old girlfriends.

Leonard and Howard engineer a distraction for Sheldon to keep him from hindering progress on the guidance-system project.

Amy is incensed when she learns Sheldon has shared intimate relationship information, and Raj's father stops sending financial support.

Raj finds himself in a cash crunch and turns to Sheldon to help him. Meanwhile, Penny considers crashing the guys' annual Comic-Con getaway.

Leonard and Penny offer Sheldon's old room to Raj after he moves out of his apartment.

Raj moves in with Leonard and Penny, and a period of adjustment begins, while usually self-centred Sheldon shows surprising interest in Amy's work.

Sheldon is pushing himself with too many collaborations. Bernadette's maternity leave is running out, and she must face going back to work.

Leaving the baby in daycare proves to be tough for Bernadette, and geologist Bert digs up a girlfriend, but some colleagues think she's a gold digger.

She Can Put The Barrier Up. Content creator Billie faces cruel online comments over extreme facial redness. Dr. Emma gives her an unexpected diagnosis that may transform her skin.

Oh My Goodness, That's A Lump! Robert has a golf-ball-sized lump on his forehead. Other doctors have told him it's inoperable, but Dr Emma thinks she can help.