 According to Doctor Destiny he endangered all of reality, all of Space and Time so that he could win a bet at the track.Darrin uses the parallels to create favorable outcomes by sending his duplicates into a Parallel to test for a specific outcome; if they fail, he deletes that Parallel, but if they succeed, he uses their solution.Darrin used the billions he'd made from manipulating the stock market via the Parallels to become a billionaire philanthropist and playboy.