Santa Monica Studio assisted on development, The game was released on the PlayStation 2 in January 2003 in North America and in April in Europe.

The game is set in the aftermath of an alien invasion of Earth where their hazardous fuels have spawned giant monsters that battle one another in city environments.

Like the standard fighting game formula, every time a monster takes damage, their overall Health bar drops until it is completely depleted, resulting in player defeat.

Monsters can use the environment to deal out damage to their foes by making weapons of various objects found within the city, such as vehicles and rubble as projectiles, steel girders and stone columns as clubs and radio antennae as a spear to impale others, temporarily stunning them.

[4] There are also some environment pick-ups, which can increase health or stamina, appearing as green or blue orbs and floating radioactive signs.

[7] The plot is set in the 1950's where a fleet of alien flying saucer warships invade the Earth, causing massive damage.

The scientists of the world's nations manage to create a series of secret weapons, which, when activated, let loose shock waves that short-circuit the saucers and cause them to crash.

Through this, the fuel infects animals, humans, and robots, turning them into giant mutant monsters, creating a war for supremacy among them.

At a military base at Rosedale Canyon, the lead monster is confronted by a horde of irradiated giant ants and a mega robot, Goliath Prime.

There the lead monster has to fend off three Zorgulons before being abducted once more when the mothership explodes, causing the UFO to crash into the North American city of Capitol.

[17] Game Informer, however, complained about certain aspects of gameplay, that "the unblockable attacks are just downright unfair" and that "the lazy camera produces numerous blind spots throughout a battle".

[13] GameRevolution noted AI issues, that "the monsters routinely demonstrate a strong sense of self-preservation", which they called "extremely frustrating behavior".