The Romance Resonance: Sheldon is mortified when he stumbles upon an important scientific breakthrough by accident. Howard makes a romantic gesture to Bernadette. (S7 Ep6/24) [AD,S]
The Expedition Approximation: Sheldon and Raj see if they could survive a dark-matter research expedition in a salt mine by simulating the conditions in a steam tunnel. (S8 Ep6/24) [AD,S]
The Vacation Solution: Sheldon helps Amy in her biology lab after he is forced to use up two weeks of holiday, but he is bored by the tasks she gives him. (S5 Ep16/24) [AD,S]
The Maternal Capacitance: A disastrous visit from Leonard's mother Beverly has the unexpected side-effect of bringing Leonard and Penny closer together. (S2 Ep15/23) [AD,S]
The Tenure Turbulence: A tenured position becomes available at the university, and competition soon heats up when Leonard, Sheldon, Raj and Kripke all apply for it. (S6 Ep20/24) [AD,S]
The Helium Insufficiency: Sheldon and Leonard struggle to find the supplies they need for an experiment. Penny and Bernadette download a dating app for Amy. (S9 Ep6/24) [AD,S]
The Bat Jar Conjecture: Sheldon is ousted from the gang's Physics Bowl quiz team, so he decides to prove his superiority by forming his own team for the event. (S1 Ep13/17) [AD,S]
The Roommate Transmogrification: Raj decides to become Sheldon's flatmate after hearing Leonard and Priya engaging in a Star Trek bedroom fantasy. (S4 Ep24/24) [AD,S]
The Graduation Transmission: Leonard is invited to give the commencement address at his former high school. Howard and Sheldon can't make a toy drone fly. (S8 Ep22/24) [AD,S]
The Creepy Candy Coating Corollary: Sheldon is irked when Star Trek actor Wil Wheaton (guest starring as himself) takes part in the same contest as him due to a childhood snub. (S3 Ep5/23) [AD,S]
The Barbarian Sublimation: Penny becomes addicted to an online game based on the world of Conan the Barbarian and begins to pester Sheldon for advice. (S2 Ep3/23) [AD,S]
The Excelsior Acquisition: Countdown of crowning intellects from the US comedy. Sheldon goes to court after driving through a red light and misses the chance to meet Stan Lee. (S3 Ep16/23) [AD,S]