Season 10, Episode 5 - The Hot Tub Contamination
Aired October 17, 2016
When Sheldon and Amy start bickering over their living situation, Leonard and Penny step in to keep the pair separate and to give them advice on living with a significant other. Sheldon threatens to see other women if Amy won't fall in line with his demands, including for her to follow a bathroom schedule.
Meanwhile, after Howard and Bernadette blow off a planned vacation, they observe a pair of unexpected guests in their hot tub.
Season 11, Episode 5 - The Collaboration Contamination
Aired October 23, 2017
When Howard and Amy work together on a project, Sheldon and Raj struggle with feelings of jealousy and loneliness. Meanwhile, Penny and Leonard find a new way of dealing with Sheldon from an unlikely source.