Efrain Gomez

When Amy and Howard begin working together on a project, Sheldon and Raj turn to Bernadette for advice about their jealousy. Penny and Leonard figure out the secret to dealing with Sheldon.

Caroline is nervous about Max running the bar alone for the first time when she goes on a date. Sophie and Oleg decide to mix things up and go out on a date instead of staying in.

Richard is distracted while trying to finish his demonstration; Jared worries that Monica is trying to replace him; Dinesh develops a crush; Erlich's past threatens the company's chances.

Katherine and the team head to Silicon Valley to invest in green tech, including Sandbox, a potentially bogus company founded by Wesley's friend, Chase.