The Big Bang Theory
About the Show
Arch-nerds Leonard and Sheldon may know more than their fair share about subatomic particles, but when it comes to people in general, and women in particular, they're absolutely clueless...
Series 7 Summary
The seventh series begins with Leonard still away at sea as the gang are reunited for more geeky fun.
Episode 1 - The Hofstadter Insufficiency
Sheldon and Penny bond in Leonard's absence, Raj finds someone to share his heartache with, and while away at an out-of-town conference, Bernadette and Amy are 'hit on' at the hotel bar.
Episode 2 - The Deception Verification
Leonard returns early from his research expedition as a surprise for Penny, but Sheldon is upset that he wasn't in on the secret.
Bernadette becomes concerned when Howard starts to act in a moody and over-sensitive way. Could his relationship with his mother be at the heart of the matter?
Episode 3 - The Scavenger Vortex
Raj organises an epic and demanding scavenger hunt for his friends, designed to test their scientific knowledge and common sense, and it brings out some surprising traits in everyone.
As the hunt progresses, Howard and Amy bond over their shared musical tastes, Penny and Sheldon work surprisingly well together as a team, and Bernadette becomes insanely competitive.
Episode 4 - The Raiders Minimization
Amy ruins one of Sheldon's favourite films by pointing out a flaw in the storyline, so he plots revenge by trying to spoil her enjoyment of a much-loved TV show from her childhood.
Leonard takes advantage of Penny's sympathy over his rocky relationship with his mother, while Raj and Stuart create online dating profiles.
Episode 5 - The Workplace Proximity
Amy informs Sheldon that she has been asked to work on a scientific project that is taking place at his university.
He is happy with the idea until Howard, Raj and Leonard tell him that seeing Amy at home and at work would sorely test their relationship.
The debate causes a huge row between Howard and Bernadette that leaves Howard banished from their flat and sleeping on Raj's sofa.
Episode 6 - The Romance Resonance
Sheldon is mortified when he stumbles upon an important scientific breakthrough by accident. He feels like a complete fraud and is embarrassed by all the praise and attention that comes his way.
When Howard makes a romantic gesture to Bernadette, Leonard remarks that Penny isn't usually very sentimental about their relationship, so she is forced to step up her game.
Episode 7 - The Proton Displacement
Sheldon feels left out when Professor Proton (guest star Bob Newhart) asks Leonard to read his latest publication, so he befriends a TV personality from a rival science show.
Raj joins Penny, Amy and Bernadette for a girls' night creating home-made jewellery, but he grows jealous when Howard gatecrashes the event and takes over production using his engineering tools.
Episode 8 - The Itchy Brain Simulation
Leonard thinks Sheldon will over-react when he admits that he failed to return a DVD to the rental shop seven years earlier, but a surprisingly calm Sheldon finds a way to punish his friend for his past mistake.
When Raj's ex-girlfriend Lucy visits the restaurant, Penny confronts her about the way she ended their relationship, much to Raj's horror.
Episode 9 - The Thanksgiving Decoupling
Howard takes the gang to his mother's house for Thanksgiving in an effort to protect himself from the company of his grumpy father-in-law, who has also been invited.
Sheldon is not best pleased about the arrangement, but surprisingly he soon hits it off with Bernadette's father.
Penny and Leonard fall out when she tells an anecdote about a mistake she made during a previous Thanksgiving that she spent in Las Vegas with her ex-boyfriend.
Episode 10 - The Discovery Dissipation
Sheldon continues to feel guilty about the attention he is receiving for his accidental discovery of a new element.
Amy helps him to cope by asking Star Trek: The Next Generation actor Wil Wheaton to give him a pep talk, but when Leonard also tries to assist, his efforts backfire badly.
Raj stays with Howard and Bernadette for a week but makes them feel inadequate by being the perfect house guest.
Episode 11 - The Cooper Extraction
Sheldon returns to Texas when his sister goes into labour. While he is away, the gang gather at the flat to decorate the Christmas tree.
They ponder on how things would have turned out if they had never met Sheldon, and realise how much he has changed their lives.
Episode 12 - The Hesitation Ramification
When Penny's big TV acting break hits the cutting room floor, Leonard does his best to comfort her, which leads her to ask him a bold question about their relationship.
Raj and Stuart practise talking to people at the shopping centre, while Sheldon studies to be a comic genius.
Episode 13 - The Occupation Recalibration
When Penny quits her job at the restaurant in order to pursue her acting career full time and Sheldon is forced to take his unused leave by the university, the two end up spending some time together.
Howard and Raj help Amy to fend off the romantic advances of a colleague, and Stuart assists Bernadette in finding a replacement comic for Howard after she accidentally destroys his copy.
Episode 14 - The Convention Conundrum
After the guys miss out on Comic-Con tickets, Sheldon decides to hold his own comic book convention and begins to search for a suitable star guest for the event, despite his friends mocking his efforts.
Seeking a more 'grown up' social life, the girls take tea at a fancy hotel but soon come to the conclusion that maturity is overrated. James Earl Jones and Carrie Fisher guest star.
Episode 15 - The Locomotive Manipulation
Love is in the air when Amy convinces Sheldon to join her (as well as Howard and Bernadette) for a romantic train trip to Napa Valley to celebrate Valentine's Day.
Leonard and Penny volunteer to look after Raj's dog while he's out, but they have to make an emergency dash to the vet when the hound eats an entire box of chocolates.
Episode 16 - The Table Polarization
When Leonard buys a dining table for the flat, Sheldon objects strongly to such a big change in his living space and his relationship with Amy almost becomes a casualty as a result.
Howard is offered the chance to return to the International Space Station, but Bernadette has doubts about whether it's a good idea.
Episode 17 - The Friendship Turbulence
In an attempt to improve their strained friendship, Howard invites Sheldon to fly to Houston with him on a visit to NASA.
Penny's car breaks down and she worries that she'll have to go back to waitressing to pay for it. Raj asks for Amy's help to woo a woman on an online dating site.
Episode 18 - The Mommy Observation
When Sheldon pays a surprise visit to his mother in Houston, he is forced to confront a new reality.
Raj's murder mystery-themed dinner party at the flat starts several petty arguments within the group of friends, and a chat about the future.
Episode 19 - The Indecision Amalgamation
Raj is wracked with guilt about dating Lucy and Emily at the same time, and Penny wrestles with her conscience over whether to accept a role in a terrible horror film.
Meanwhile, Amy helps a conflicted Sheldon through the tense task of choosing between two gaming systems.
Episode 20 - The Relationship Diremption
Sheldon faces a personal crisis when he starts to wonder whether he's wasting his time with his study of String Theory, although Penny does her best to offer him advice.
Raj and Emily go on a double date with Howard and Bernadette, but it turns out to be an embarrassing evening for Howard, who has encountered Emily in the past.
Episode 21 - The Anything Can Happen Recurrence
Penny and Leonard try to distract Sheldon from his career problems by reinstating Anything Can Happen Thursday.
But their attempt to be spontaneous leads to unexpected friction among the gang when Amy and Bernadette are caught out after telling a lie.
Raj seeks Howard's help as he prepares for a date with Emily.
Episode 22 - The Proton Transmogrification
Sheldon struggles to process his feelings of grief when his idol Professor Proton passes away. Leonard turns a relationship milestone into a competition with Penny.
When the gang gather to celebrate Star Wars Day, Amy and Bernadette decide to make a special gift for the guys.
Episode 23 - The Gorilla Dissolution
A horrible day at work prompts Penny to evaluate her life choices - including taking a big step with Leonard.
Howard and Bernadette struggle to care for Mrs Wolowitz, and Raj gets relationship advice from Sheldon.
Episode 24 - The Status Quo Combustion
With potential changes affecting his professional, domestic and social life, Sheldon is forced to confront an uncertain future and considers a major move, which worries Penny and Leonard.
Howard and Bernadette struggle to keep Mrs Wolowitz's carers from walking out. Raj is overjoyed when he and Emily take their relationship to the next level.
The Big Bang Theory synopsis
Arch-nerds Leonard and Sheldon may know more than their fair share about subatomic particles, but when it comes to people in general, and women in particular, they're absolutely clueless...Episode Guide >
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In the opening episode, Penny tags along to Sheldon's first ever date with a woman he's been texting for months.