In The Big Bang Theory ‘ s tenth season, Sheldon and Amy’s relationship strengthens when they move in together, only to be challenged by the reappearance of somebody from Sheldon’s past. Leonard and Penny have a second wedding ceremony and adjust to a new living situation when they ultimately live alone as husband and wife. Howard and Bernadette greet the birth of Halley and struggle to return to work after their parental leave. Raj is single again and tries to get back on the dating scene while his lifestyle takes a hitting after he cuts himself off from his father’s money. Meanwhile, Sheldon, Leonard, and Howard must work together on their guidance system for the Air Force.