Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."

When Sheldon learns the guys tampered with his expedition data he got from the arctic, he leaves to Texas in disgrace. This results in the guys following him, which threatens Leonard's hope for some romantic time with Penny and the guys' friendship with Sheldon.

When Leonard and Penny aren't speaking, Sheldon goes to extremes to keep them both happy.