Picture 2 / 20
![Picture 2 / 20](/./images/uploads/4/44401c441ac0b315c14.jpg)
The Collaboration Fluctuation
Season 10, Episode 19 - Aired March 30, 2017
When Penny and Raj enjoy spending time together as roommates, Leonard starts to feel like a third wheel. Meanwhile, Sheldon's interest in Amy's work leads them to collaborate, but they soon find they can only work well together when they're at each other's throats.