Series 12 Episode 4
When Sheldon won't tell anyone why he's never mentioned Tam, his childhood best friend, Leonard tries to find out. Penny and Bernadette invite Raj's fiancée Anu out for dinner to get to know her.
Series 12 Episode 1
The Conjugal Configuration: Sheldon and Amy's honeymoon runs aground in New York. Raj starts a social media dispute.
Series 12 Episode 1
Series 12 Episode 2
The Wedding Gift Wormhole: Sheldon and Amy try to figure out the function of a wedding gift from Leonard and Penny
Series 12 Episode 2
Series 12 Episode 3
The Procreation Calculation: Howard and Bernadette's life gets complicated when Stuart brings his new girlfriend home
Series 12 Episode 3
Series 12 Episode 4
The Tam Turbulence: Leonard tries to find out why Sheldon has never mentioned Tam, his childhood best friend
Series 12 Episode 4
Series 12 Episode 5
The Planetarium Collision: Sheldon sabotages Amy's career. Howard is asked to co-host Raj's show at the planetarium.
Series 12 Episode 5
Series 12 Episode 6
The Imitation Perturbation: Howard dresses up as Sheldon for Halloween, but Sheldon gets his own back later at a party
Series 12 Episode 6
Series 12 Episode 7
The Grant Allocation Derivation: Leonard faces tough choices when he is made responsible for distributing extra grant money
Series 12 Episode 7
Series 12 Episode 8
The Consummation Deviation: Sheldon attempts to befriend Amy's father, but ends up having to bond with her mother
Series 12 Episode 8
Series 12 Episode 9
The Citation Negation: Bernadette asks Stuart's girlfriend Denise to teach her how to beat Howard at a video game
Series 12 Episode 9
Series 12 Episode 10
The VCR Illumination: A VHS tape from Sheldon's past inspires him not to give up on his latest scientific theory
Series 12 Episode 10
Series 12 Episode 11
The Paintball Scattering: Raj spots Anu talking to her ex-boyfriend. Penny and Leonard organise a paintball game.
Series 12 Episode 11
Series 12 Episode 12
The Propagation Proposition: Penny's ex Zack and his wife ask Leonard for a favour. Raj tries to make up with Anu.
Series 12 Episode 12
Series 12 Episode 13
The Confirmation Polarization: Sheldon and Amy's super-asymmetry theory is proved correct by two physicists from Chicago
Series 12 Episode 13
Series 12 Episode 14
The Meteorite Manifestation: Sheldon is thrilled to help Howard and Bernadette navigate some bureaucratic paperwork
Series 12 Episode 14
Series 12 Episode 15
The Donation Oscillation: Penny attempts to sabotage Leonard's efforts to help Zack and Marissa have a family
Series 12 Episode 15
Series 12 Episode 16
The D & D Vortex: The gang find out Wil Wheaton's hosting a celebrity game of Dungeons & Dragons at his home
Series 12 Episode 16
Series 12 Episode 17
The Conference Valuation: Penny and Bernadette go away to a sales convention, leaving Howard in charge of the kids
Series 12 Episode 17
Series 12 Episode 18
The Laureate Accumulation: Sheldon and Amy ask some Nobel laureates to take their side against academic competitors
Series 12 Episode 18
Series 12 Episode 19
The Inspiration Deprivation: Amy has a meltdown when she feels pressure over the possibility of winning a Nobel Prize
Series 12 Episode 19
Series 12 Episode 20
The Decision Reverberation: Raj feels worried after publishing a paper that suggests he may have discovered alien life
Series 12 Episode 20