Raj's sister Priya comes to visit. She and Leonard have a secret sexual relationship, which is discovered by Sheldon.
Tropes appearing in the episode
- Absentee Actor: The second of two "Penniless" episodes, due to Kaley Cuoco having suffered an injury while horseback riding.
- My Sister Is Off-Limits!: Raj's attitude about Leonard or Howard hooking up with Priya.
- Remember the New Guy?: Although this is Priya's first appearance on the show, the whole cast previously met her on an earlier visit that took place before the pilot and thus greet her as though she's a returning character. Technically, Penny hasn't met her yet, but Penny isn't in this episode.
- Spit Take: At the end of the episode, Leonard does this when he found out the flavor for Sheldon's snow cone is Mango Caterpillar.