Mega Man X, commonly known as "X", was created by Dr. Thomas Light an unknown number of years after the Mega Man series. X was a new type of robot with the ability to make his own decisions. Recognizing the potential danger of this model, Light sealed X away in a diagnostic capsule for over 30 years of testing. Though what happened to him during these years is not specifically mentioned, it is assumed that Dr. Light died and left his diagnostic experiments unfinished. X's capsule was uncovered by an archaeologist named Dr. Cain almost 100 years after X's creation. Excited by the possibilities X presented, Cain disregarded the warnings Light had logged in the capsule and created a legion of new robots that replicated X's free will; these robots were called "Reploids" ("Repliroids" in Japan).