War World

War World was the planetary seat of Mongul's empire.

History
The planet's original name is unknown. Mongul named it "War World" for the gladiatorial spectacles he continuously staged on the planet, for the amusement (and distraction) of his people. It was also the seat of his government (though he paid little attention to the daily business of ruling his subjects) and the headquarters of his military.

Outside of the massive arena where the fights were staged, the cities of War World were run down, and its citizens largely destitute and downtrodden.

War World's atmosphere also had debilitating effects on the physiology of both Kryptonians and Martians.

When Superman was brought to War World to compete in the games, he successfully overthrew Mongul, with the help of J'onn J'onzz and Draaga, and left rule of the planet to Draaga.

Background information
In the comics, War World is a space-faring battle station the size of a small moon or planet (similar to the Death Star from Star Wars), which Mongul uses to travel the galaxy and conquer various star systems. In the Gladiatorstory arc, Superman successfully defeats Mongul and War World is destroyed.

In the Return of Superman storyline, Mongul, in alliance with The Cyborg (Hank Henshaw) comes to Earth and destroys Coast City (the home of Green Lantern Hal Jordan)then builds a massive city-sized engine, as part of his scheme to transform Earth into another War World.

The Cyborg also attempts, briefly, to transform Apokolips into another War World, while Doomsday is rampaging across the world and manages to defeat Darkseid.