As the newest substitute teacher at La Salle High School, Kevin tries to help an introverted student named Adam become more self-assured and popular. However, to do so, he must first pull off the second greatest freshman prank in the school’s history. Meanwhile, Yvette contemplates life after the mission, and Amy and Nate struggle to plan the perfect first date.

Feeling guilty about the role he played in getting the former high school security guard fired, Kevin looks to help Becky follow her true passion: inventing. With Amy and Tyler's assistance, they enter Becky's newest invention into a local Entrepreneur Expo with hilarious results. Meanwhile, Yvette is forced to come to terms with Dave's disappearance.

Kevin struggles with the idea that his relationship with Kristin might be in jeopardy while helping a stranger honor his deceased uncle’s burial wishes. Yvette makes a drastic decision regarding her future with Kevin by involving a celestial colleague named Cindy and Amy receives an unexpected visit that changes everything.