Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.
Pete and Debbie are both about to turn 40, their kids hate each other, both of their businesses are failing, they're on the verge of losing their house, and their relationship is threatening to fall apart.
An inventor and his mom hit the road together so he can sell his latest invention.
