Ep 15. The Valentino Submergence

Sheldon and Amy host their first Valentine's Day together as a couple, but their plans take a turn when Amy suddenly declines Sheldon's invitation to a romantic weekend getaway. Meanwhile, Leonard and Penny's Valentine's Day plans also hit a snag when they get stuck in an unexpected situation with Raj, Howard, and Bernadette. Elsewhere, Stuart seeks attention from the gang, but his attempts only lead to more self-doubt. As everyone's Valentine's Day plans go awry, they discover new ways to appreciate and celebrate their relationships with each other.