Disagreements arising from Sheldon (Jim Parsons) and Amy‘s (Mayim Bialik) attempts to live together provide the show a chance to offer some interesting pairings in “The Hot Tub Contamination.” While the episode derives its title from the (less interesting) B-story involving Howard (Simon Helberg) and Bernadette‘s (Melissa Rauch) discovery of what happens in their home when some of their friends think they aren’t around, more interesting is the pairing of Penny (Kaley Cuoco) and Sheldon, which delivers the truth behind Sheldon’s committal to always knock three times, and the far-less developed camaraderie between Leonard and Amy who do some bonding of their own over the whackadoodle they both know and love.
A burst pipe in Amy‘s (Mayim Bialik) apartment has domino effects for her boyfriend and roommates. Presented as a five-week experiment, Amy convinces Sheldon (Jim Parsons) to live with her in Penny‘s (Kaley Cuoco) apartment while allowing the newlyweds some much-needed alone time. The results are what you would expect – untempered glee from Leonard and Penny and new struggles for Sheldon and Amy (some of which provides amusing moments including Leonard’s words of advice for Amy). The episode also throws in a B-story involving the Walowitzes most notable for the pair calling and hanging up on Raj (Kunal Nayyar) repeatedly in the middle of the night.
“The Dependence Transcendence” juggles three separate amusing, although mostly forgettable, storylines. Leonard (Johnny Galecki) and Howard (Simon Helberg) struggle to make their deadline to the Air Force while dealing with Sheldon‘s (Jim Parsons) overreaction to his first energy drink. In truth, however, his fear of an instant caffeine addiction is hiding his true doubts about being able to figure out the complex math required. Meanwhile Penny (Kaley Cuoco) tags along with Amy (Mayim Bialik) to Bert’s party where she discovers her friend is more popular at work than either of them ever suspected, and Raj (Kunal Nayyar) spends some time with Bernadette (Melissa Rauch) whose insecurity about not being more excited about her pregnancy begins to cause friction between the pair.
“The Military Miniaturization” is a fine, if forgettable, episode. In the main story Leonard (Johnny Galecki), Sheldon (Jim Parsons), and Howard (Simon Helberg) fret over the ethical implications surrounding the Air Force’s offer to fund their research. The back-up story features a pissed-off Bernadette (Melissa Rauch) learning that Penny (Kaley Cuoco) accidentally spilled the beans about her pregnancy to her coworkers (possibly costing her lead on a big project). The episode’s only real stand-out moment comes when Sheldon reacts silently to the Air Forces pitch (although the scene would have been more memorable had the scientist been able to keep his silence throughout the entire sequence).