The anti-spirals are a mysterious race who thought that spiral power (the power of evolution) will destroy the universe. In an effort to stop the universe's destruction, they halted their own evolution and used their combined psychic power to seek out and destroy any spiral life (life that's capable of evolving). After defeating the few spiral species that fought back, they made those that lost, including mankind, live in oppression for thousands of years. Humanity eventually rose up to fight once again and after a tough battle, mankind won and defeated the anti-spiral. It is unknown if they're right about spiral power one day destroying the universe.