- Penny decides to learn more about what Leonard does at work and gets turned on by it. His intelligence sparks their sex life.

- Sheldon and Amy decide to dress up together for Stuart's Halloween party, but have trouble coming up with a compromise. They end up dressing up as Raggedy Ann and Raggedy C-3PO.

- Howard's incessant talk about his space trip starts to annoy Bernadette and his friends. He feels he needs to talk about it to validate his life. Bernadette gives his ego a boost by saying she married him, not astronaut him.