The Big Bang Theory

    • Episode 1 - The Conjugal Conjecture

      The group of friends face an awkward morning after Sheldon's mother and Leonard's father share an evening together. Penny's family arrive in town to attend Penny and Leonard's second wedding ceremony.

    • Episode 2 - The Military Miniaturization

      Howard has a meeting with Air Force representative Colonel Williams about the gyroscope he invented with Leonard and Sheldon. Penny carelessly reveals Bernadette is pregnant to her colleagues at work.

    • Episode 3 - The Dependence Transcendence

      The guys work around the clock on the Air Force project, leaving Sheldon fighting to stay awake. Penny and Amy attend a university gathering. Raj learns Bernadette's true feelings about her pregnancy.

    • Episode 4 - The Cohabitation Experimentation

      When Amy's apartment is flooded, she proposes a 'cohabitation experiment' with Sheldon while it is repaired. Raj finds out the gender of Howard and Bernadette's unborn child before they do.

    • Episode 5 - The Hot Tub Contamination

      Leonard and Penny intervene when a cohabiting Sheldon and Amy have an argument about their 'bathroom schedule'. Howard and Bernadette's secret stay-cation is interrupted by unexpected guests.

    • Episode 6 - The Fetal Kick Catalyst

      Penny and Leonard attend a comic book convention, where Penny is surprised to meet fans of her acting work. Sheldon and Amy host a brunch at Penny's flat and Howard makes an impulsive purchase.

    • Episode 7 - The Veracity Elasticity

      Amy lies to Sheldon by telling him the completed repair work on her flat is still ongoing so that they can carry on living together. Penny moves Leonard's collectables into storage behind his back.

    • Episode 8 - The Brain Bowl Incubation

      Sheldon goes to great lengths to convince Amy that they should have a baby together. Raj feels too embarrassed to tell his friends what the new woman in his life does for a living.

    • Episode 9 - The Geology Elevation

      Sheldon can't contain his jealousy when he hears that his university colleague Bert the geologist has won a prestigious fellowship. Howard finds an old remote-controlled toy that he made in the past.

    • Episode 10 - The Property Division Collision

      Sheldon, Amy, Leonard and Penny divide up all their possessions into two separate households, but tension ensues. Raj and Stuart compete to become indispensable to Howard and Bernadette.

    • Episode 11 - The Birthday Synchronicity

      Sheldon and Amy attempt to celebrate her birthday with an intimate night at home. Bernadette goes into labour, so Howard, Raj and Stuart rush the expectant mother to the hospital.

    • Episode 12 - The Holiday Summation

      The gang gather for a post-holiday catch-up and hear all about Sheldon and Amy's terrible trip to Texas, Leonard and Penny's Christmas tree struggles, and Howard and Bernadette's first days as parents

    • Episode 13 - The Romance Recalibration

      Penny thinks Leonard has stopped making an effort in their relationship so she departs for a spa weekend with Amy. Howard and Raj try to stop the noise made by a squeaky floorboard in the baby's room.

    • Episode 14 - The Emotion Detection Automation

      Sheldon tests a newly invented device after hearing that it can help him to read people's emotions. Raj gathers his former girlfriends together so that they can give him some dating advice.

    • Episode 15 - The Locomotion Reverberation

      Leonard and Howard attempt to distract Sheldon with a trip to a historic railway when he slows the progress of their work on the Air Force guidance system. Raj and Stuart look after baby Halley.

    • Episode 16 - The Allowance Evaporation

      Amy is furious when she learns Sheldon has shared intimate details of their relationship with his colleagues at the university. Raj considers trying to live without financial support from his father.

    • Episode 17 - The Comic-Con Conundrum

      Cut off from his father's fortune, Raj struggles to balance his books and decides to appoint Sheldon to organise his finances and get him out of debt. Penny considers joining the guys at Comic-Con.

    • Episode 18 - The Escape Hatch Identification

      Leonard and Penny offer Sheldon's old room to Raj when he is forced to move out of his flat to save money, leading to unexpected conflict among the gang and unwanted observations from Leonard's mother

    • Episode 19 - The Collaboration Fluctuation

      Leonard, Penny and Raj settle into their new living arrangement, but Penny and Raj get along so well that Leonard starts to feel left out. Sheldon and Amy begin to collaborate on a scientific project.

    • Episode 20 - The Recollection Dissipation

      Sheldon pushes himself to the limit when he collaborates on two projects - one with Leonard and Howard, plus another with Amy - on the same day. Bernadette nears the end of her maternity leave.

    • Episode 21 - The Separation Agitation

      Howard and Bernadette find it upsetting to leave Halley at the nursery when Bernadette returns to work at the end of her maternity leave. Bert the geologist introduces the gang to his new girlfriend.

    • Episode 22 - The Cognition Regeneration

      Leonard isn't thrilled when he finds out Penny is considering taking a new job that has been offered to her by her ex-boyfriend Zack. Sheldon tries to develop his brain further by learning new skills.

    • Episode 23 - The Gyroscopic Collapse

      Amy is offered a visiting research fellowship at Princeton University. Raj makes new living arrangements. The guys complete their infinite persistence gyroscope project but events spin out of control.

    • Episode 24 - The Long Distance Dissonance

      The gang become concerned about the situation when Sheldon's former admirer, Dr Ramona Nowitzki, resurfaces while Amy is away working at Princeton University