the king on the BAD GUY side is
DOOMSDAY

Doomsday's strength and invulnerability rival that of Superman. A virtually mindless creature, Doomsday seems to live only for destruction.

Real Name: N/A
Occupation: N/A
Base of Operations: N/A
Height: 7' 0"
Weight: 615 lbs.
Eyes: Red
Hair: White
First Appearance: SUPERMAN: THE MAN OF STEEL #17 (November, 1992)

The monster known as Doomsday was created hundreds of thousands of years ago as part of an alien genetics experiment. The experiment worked all too well, producing a living engine of destruction, a virtually immortal creature who seems to take an obscene delight in violence and death.

Doomsday very nearly destroyed the Justice League of America. His cross-country rampage was finally stopped by Superman (see SUPERMAN) only after an epic battle that ended in the apparent death of the Man of Steel himself.

After his recovery, Superman discovered that Doomsday still lived as well. The Man of Steel pursued the monster across the cosmos and eventually stranded him at the end of time.

Guided by Brainiac (see BRAINIAC), Doomsday recently returned to challenge Superman and the Justice League once more.

http://www.dccomics.com/sf/dd0.htm