E4 +1 Thursday

Sheldon discovers his friends tampered with the Arctic expedition data, and Leonard gets frustrated as constant interruptions hamper his attempts to woo Penny

Sheldon and Howard stake their most coveted comic books on a bet over the species of a cricket. Jim Parsons and Simon Helberg star

Sheldon succeeds in getting Penny to conform to his standards, so Leonard adopts a similar strategy. Meanwhile, Howard and Raj meet two women at a goth nightclub

Alex is up for a prestigious government job that requires a family interview, causing everyone to overcompensate, while Haley and Dylan think it might be time they grew up a little

Jerry comes to town to bequeath Dede's possessions to the family and Mitch and Claire receive a little more of her than they bargained for

Comedy clips showcasing amusing internet videos featuring sports of the lawnmower, motorcycle and bicycle variety

Penny is stunned when Sheldon announces he is about to go on his first-ever date, and Howard's new robotic arm creates problems

Sheldon tries to extend his lifespan, concerned he will not be around long enough for his consciousness to be downloaded into a robot body. Guest starring Steve Wozniak

Sheldon searches for an alternative to human companionship following his break-up with Amy, and things take a turn for the worse when he starts buying pet cats in bulk

An embarrassing secret from Howard's past comes to light as he tries to win back Bernadette, while Sheldon and Raj engage in a battle of wills at work

Leonard is depressed that everyone is paired off except him, and resorts to desperate measures to get a girlfriend, while an anxious Sheldon looks for a way out of his relationship

A visit from Raj's sister Priya creates tension among the guys, especially when Leonard has to coax Sheldon into hiding his romantic past with her from the rest of the gang

Leonard vows to be more confident around women, and an FBI agent assesses Howard's suitability for a team working on a new surveillance satellite. Guest starring Eliza Dushku

The friends set up camp outside a cinema to get tickets for a new cut of Raiders of the Lost Ark - but find themselves resuming hostilities with Sheldon's old foe Wil Wheaton

Penny's dad visits and Leonard discovers she told her parents they were back together, so he plays his boyfriend role to the hilt - much to her dismay. Keith Carradine guest stars

Amy is attracted to Penny's former boyfriend Zack, while Raj and Howard compete to prove which of them would make the better superhero

The guys have fun at the expense of Penny's boyfriend Zack, but later try to make amends by enlisting his help with a New Year's costume competition

Leonard's idea for a smartphone app puts pressure on his friendship with Sheldon, who vies with him for control of the project. Starring Johnny Galecki and Simon Helberg

Tension mounts when the pals attend a weekend science conference and Bernadette runs into a former boyfriend, leaving Howard in an argumentative mood

Sheldon participates in a series of short lectures, but worries about the students' reactions to him, and asks Penny for acting lessons to help him engage with his audience

A wealthy benefactor at the university makes Leonard consider how far he is willing to push himself in the name of science. Comedy, starring Johnny Galecki

Howard is torn between Bernadette and his mother. Leonard rekindles his romance with Raj's sister Priya, and Amy uses Penny's emotions as the basis for a research project

Sheldon decides to make a new set of friends as he is depressed that the group's social world revolves around Leonard rather than himself. Guest starring LeVar Burton

Leonard faces a choice between his relationship with Priya and his friendship with Penny, while Sheldon is irritated by one of Howard's magic tricks. Starring Johnny Galecki

Sheldon is distraught when his online gaming account is hacked, so his friends decide to find out who is responsible - but make the mistake of confronting the culprit in person

Amy and Sheldon start a gossip experiment to see how quickly rumours spread among the gang, while Howard tells his friends he is planning to propose to Bernadette

Sheldon is infuriated when Priya uses her legal knowledge to find a loophole in the room-mate agreement - but his spirits are lifted by a night on the town

Amy and Penny ask Bernadette to help them spy on Leonard and Priya after the couple invite her and Howard to dinner. Raj finds a cure for his fear of talking to women

Howard decides to tell his mother that he and Bernadette are engaged - but she later collapses, making him fear the shock of the news has caused her to suffer a heart attack

Raj becomes Sheldon's new flatmate, and after Bernadette receives her PhD the friends tease Howard about being the only one among them who is not a doctor

Homer wins a motorcycle and forms his own gang - only to encounter trouble in the form of bikers the Hell's Satans. Featuring the voices of John Goodman and Henry Winkler

Lisa tries to make herself popular by ghost-writing positive things on the internet. When it backfires, Lady Gaga shows her what fame is all about

Harry Hill, Martin Kemp, Roisin Conaty and Bill Turnbull take part in the charity contest, hosted by Sandi Toksvig and Noel Fielding

The armchair critics share their opinions on The Celebrity Traitors, Strictly Come Dancing, Hollyoaks, Dragons' Den, Beat the Chasers and the BBC News

As the experience nears its end, big decisions send shockwaves through the house, with four couples forming final matches, leaving four singles out in the cold

A professional dancer seeks a man with whom to lose his virginity and a rugby player who is shy with women hopes that seeing a potential date naked will give him a confidence boost

Raj receives advice from Sheldon after he sees Emily on a date with another man, while Penny gets fired from the movie, prompting her to take a serious look at her life

Sheldon becomes upset about his career, the destruction of the comic-book store and Leonard and Penny's future living arrangements

Fred Sirieix and his team head for the British countryside to celebrate love in the most festive of locations, where 28-year-old Holly goes on a date with 32-year-old Shane

Things are finally working out for Adam, until he receives a letter from NYU that could change everything, while Barry hears that the JTP have other friends outside the crew

Homer and Marge take the kids to Diz-Nee Land, where they discover a ride that transports them to the home planet of Kang and Kodos

Homer makes a connection with Bart after being hypnotised into thinking he is a 10-year-old boy, and the pair embark on a series of mischievous adventures

Gloria secretly baptises the twins, Claire is still dealing with the fallout from the smart closet fiasco, and Cam goes to war with his school's mascot

Jay helps out Mitchell when he throws a slumber party for Lily's Vietnamese dance troupe and Gloria and Manny stage a hot pepper heist when a huge sauce order comes in

Phil and Luke hold Claire back as she tries to declutter, Cameron panics when Jay decides to take up a new hobby and Gloria tries her hand at golf

Penny is stunned when Sheldon announces he is about to go on his first-ever date, and Howard's new robotic arm creates problems

Sheldon tries to extend his lifespan, concerned he will not be around long enough for his consciousness to be downloaded into a robot body. Guest starring Steve Wozniak