Oscar drives the school bus and decides to lay down the law on "unruly" students. Karen accidentally knocks out Davis and it ruins his reputation. Wanda gets addicted to an energy drink while Brent tries to avoid helping Emma around the house.

Oscar becomes obsessed with killing a mouse in Corner Gas and Davis plans to capture it safely; Emma and Karen try different approaches to fixing Wanda's back; Brent and Hank try to trick Lacey with their made-up game.