Penny is thrown for a loop when Leonard is offered a temporary job overseas, but the news is an even bigger shock to Sheldon. Raj wants more out of his relationship with Lucy than she can handle and their relationship comes to a crossroads, which leads to Raj undergoing a major transition.
- "Dear John" Letter: How Lucy breaks up with Raj - she sends it by email.
- Green-Eyed Monster: Sheldon is jealous that Leonard is getting a chance to work with Stephen Hawking for an expedition. But then it turns out Hawking will not be on the boat Leonard is boarding.
- Not So Different: Amy towards Lucy. Amy knows how it feels to be an outsider, making her the ideal choice to meet with Lucy.
- Wham Episode: Raj finally overcomes his selective mutism.
- Wham Line: "No, I haven't had a drink since last night."