Ultraman is the name of several supervillains appearing in stories published by DC Comics. The characters are all evil or corrupted alternate-universe counterparts of Superman. Ultraman first appeared in Justice League of America #29.
Antimatter Clark Kent as Ultraman.
Earth-Three, or simply Earth-3 or Earth 3, is a “partially-reversed” Earth, where supervillainous counterparts of the mainstream DC superheroes reside. It first appeared in Justice League of America #29, and the concept has been rebooted several times.
The Crime Society of America from 52 Week 52, art breakdowns by Keith Giffen.