In "The Hack-a-Thon," now that everyone has pitched their ideas and sized up their competition, they are ready for their second assignment. Charlie informs the entrepreneurs that they will participate in a hack-a-thon; they have thirty-six hours to create an entirely new business idea and present the working prototype to Tim, Jesse Draper and Ben Parr. As the deadline rapidly approaches, Shawn, David, Carly and Malcolm's confidence in their project may prove to be their undoing, while Keyonna's team aims to redefine sperm donation. Meanwhile, Tony struggles with Charlie's latest challenge, and David and Keyonna take an instant dislike to each other.