TV Guide TLC Monday

Buying goods from the comfort of home

Buying goods from the comfort of home

Leonard and Amy are forced to take an unexpected road trip to Arizona to pick up Sheldon after his epic railway journey ends in chaos. Meanwhile, Howard finds Stuart's relationship with his mother strange, and Penny has an interview for a sales job at Bernadette's workplace. Comedy, starring Johnny Galecki, Jim Parsons and Kaley Cuoco

Sheldon is forced to teach a course at the university, and Howard surprises the gang when he decides to enrol on it. Meanwhile, Amy plays Penny and Bernadette off against each other while the tension brews over Penny's new job. Comedy, guest starring Regina King (Southland), with Johnny Galecki, Jim Parsons and Kaley Cuoco

Leonard and Penny attempt to prove Sheldon wrong when he claims that he and Amy have a superior relationship. Meanwhile, Howard is nervous when Nasa asks him to throw the first pitch at a baseball game honouring National Space Day. Comedy, starring Johnny Galecki, Jim Parsons and Kaley Cuoco

Raj's girlfriend Emily (Laura Spencer) gives Penny the cold shoulder when she learns about his past. Meanwhile, the guys debate investing in Stuart's comic-book shop and becoming part owners of the business. Comedy, starring Johnny Galecki, Jim Parsons and Kaley Cuoco

Penny is forced to revise for a work assessment during the girls' trip to Las Vegas, and Amy and Bernadette accuse her of spoiling their fun. Meanwhile, the guys try to invent something of scientific importance - but only come up with new ways to procrastinate. Comedy, starring Johnny Galecki, Jim Parsons and Kaley Cuoco

Leonard and Penny ask Howard and Bernadette for advice when they argue about money. Meanwhile, Sheldon and Raj try to find out whether they could survive a dark matter research expedition in a salt mine by attempting to simulate the conditions in a steam tunnel beneath the university. Comedy, starring Johnny Galecki, Jim Parsons and Kaley Cuoco

Penny is left in a difficult professional situation when a doctor (guest star Billy Bob Thornton) turns up at her door following her flirtatious sales technique, so the guys try to help her out. Meanwhile, Amy and Bernadette have a dispute over whether female scientists should flaunt their sexuality to try to get ahead at work. Comedy, starring Johnny Galecki, Jim Parsons and Kaley Cuoco

The gang re-creates a prom night on the roof of the apartment building when the girls decide they would like to re-enact their evenings with their current partners. However, Sheldon feels under pressure to take part in all the romantic traditions, and Howard worries about who Stuart will bring as his date. Comedy, starring Johnny Galecki, Jim Parsons and Kaley Cuoco

Sheldon visits the California Institute of Technology for the very first time. Georgie is furious when Mary listens in on a phone call with his girlfriend, while Meemaw tries to cheer up a jealous Missy

Dr Sturgis is furious when Sheldon accuses him of plagiarism. Mary sets out to find a suitable 'girl trophy' for Missy's end-of-season baseball ceremony, and Georgie has an awkward run-in with Veronica while on a date with new girlfriend Jana

Sheldon panics when Leonard announces he has to go into hospital for surgery, and the impending divorce of Raj's parents motivates Howard and Bernadette to work on their own marriage. Comedy, starring Johnny Galecki, Jim Parsons and Kaley Cuoco

Sheldon bids an emotional goodbye to Fun with Flags as he and Amy record the final instalment of the internet show. Leonard, Howard and Raj clear out the office of a recently deceased professor and take a peek at his research. Guest starring LeVar Burton