The Separation Triangulation
Raj becomes involved with a recently separated school teacher, and her husband is anxious to meet him.
The Solo Oscillation
When Sheldon kicks Amy out to work solo, she and Leonard bond during a series of science experiments. Also, Bert the geologist replaces Wolowitz in the band Footprints on the Moon, and Sheldon finds Penny a surprising source of scientific inspiration.
The Matrimonial Metric
Sheldon and Amy will try to use science to see who should be their Maid of Honor and Best Man.
The Celebration Reverberation
Sheldon and Wolowitz plan birthday celebrations for Amy and Halley, respectively. Also, Leonard receives a Christmas letter from his brother that causes him to spiral out about his own lack of accomplishments.
The Confidence Erosion
Sheldon and Amy try to use math to eliminate wedding planning stress; Koothrappali “breaks up” with Wolowitz after realizing he is hurting his confidence.
The Bitcoin Entanglement
The gang hunts for a “valuable” old laptop.
The Tesla Recoil
Leonard and Wolowitz are furious when they learn Sheldon worked with the military behind their backs; Bernadette suspects Ruchi is trying to steal her job.
The Geology Methodology
Sheldon tries to keep his collaboration with Bert a secret; Penny and Bernadette coach Koothrappali on navigating his relationship with Ruchi.
The Proton Regeneration
Sheldon auditions for the role of the new Professor Proton; Penny takes care of Halley when Bernadette and Wolowitz need bed rest.
The Collaboration Contamination
Sheldon and Koothrappali confide in Bernadette when they can’t handle Amy and Wolowitz working together; Penny and Leonard learn a secret from an unlikely source about dealing with Sheldon.