There are two major continuities, the Robot (began with the original NES series) and the Network series (which began with the Battle Network series). Both are focused around the advanced cybernetics technology created by Doctor Thomas Light, a brilliant scientist whose inventions revolutionized tech for centuries. In the Classic series, his specialty was robotics, creating the eponymous character as an assistant and a son. In the Network continuity, he invented the Internet and NetNavis which soon sprawled into an entire other universe called the Cyber World. In both series his rival and former friend, Doctor Albert Wily, was jealous of Light and began a crusade against everything Light stands for, forcing the hero Mega Man to stop him.