497 AI-androids called 97s were created to compete with some of the greatest athletes on Earth. 97s were so good that humans no longer saw a reason to compete.
After boredom struck, the 97s decided to leave Earth and test their skills against the universe. They built a coliseum where challengers from all over the galaxy can compete. Remaining undefeated the 97s decided to claim the universe, calling it the 97 Universe.