This 80sTees.com exclusive Transformers t-shirt shows Optimus Prime holding the Matrix of Leadership. The shirt reads Autobots Assemble. Within Optimus Prime's chest is a mystic talisman, known as the Autobot Matrix of Leadership. This makes Prime the leader of the Autobots, and as such, he takes the other Autobots into battle to protect the galaxy from the dreaded Decepticons. Optimus Prime has proven time and time again to be an honorable warrior, making him one of the most popular cartoon characters of all time.