Doomsday has become an icon of Superman's long list of villains thanks to his brutal debut, where he murdered the Man of Steel in a shockingly violent manner. But while Doomsday is most well known as one of Superman's most powerful enemies, the gray monstrosity did not always consider the Man of Steel to be his greatest threat. Doomsday has existed for thousands of years, besting hundreds of superpowered entities before Superman was even born; but there was only one like Superman who could beat Doomsday.
Source：https://www.cbr.com/superman-doomsday-greatest-foe-dc/
