Penny tells Gordon that his mother called and said she is thinking about coming to the West Coast.
She takes the moment to confront him about how he hasn't told his mother they are living together yet—although they laugh it off, a sore spot is obviously forming.
They go to the Limehouse for dinner where they bump into Elizabeth and Bernard Carroway of the physics department. The Carroways are having dinner with famed astrophysicist John Boyle.
Penny and Gordon join them, and Penny charms the pants off everyone and even helps Gordon by setting him up for some social alley-oops.
After dinner, the group goes out to see Lawrence of Arabia.
Penny and Gordon get intimate at home, and Gordon realizes they make a good "us."