The inaugural Hack-A-Sat was a Capture the Flag competition designed to spark interest and advance the skills of security researchers to secure space systems. The event started with a Qualification Round in Spring 2020. Over 6,000 competitors took part, organized into 2,213 registered teams. Eight teams emerged to compete at the final Capture the Flag event at DEF CON Safemode 28. Over the course of two days, competitors worked through a series of five flatsat challenges and had the chance to have one of their solutions uploaded to an on-orbit satellite—all while spectators watched the action and learned more about cyber security in space through a unique 3D Hacker’s Den environment.