One of the Xilien's many pawns in their pursuit to conquer Earth and harvest the needed mitochondria, Kamacuras, like its monstrous brethren, possess a gene dubbed M-Base. The gene allowed the Xilien's total control over the creatures, as they were dispatched in a global assault. Kamacuras, a central participant during this first strike, was unleashed on Paris, France. The giant mantis quickly tore through its surroundings, decimating age old structures in its path. The EDF was quick to meet the attack head-on, though, and dispatched Eclair, one of their aerial war-machines, to fight off the invader. The battle was fierce, yet neither combatant held a clear advantage. As Kamacuras leapt on top of the airborne battleship and began to batter the ship with its claws, the Eclair unleashed a payload of heat seeking missiles that tore into the giant mantis, but was not enough to down the monster. Before the confrontation could end, though, Kamacuras, along with the rest of the attacking monsters, suddenly vanished in a display of lights.

There was no time for celebration amongst the confusion, however, as the Xilien's revealed themselves to humanity. Using the disappearance of the monsters as a sign of friendship, the Xilien embarked on a more settle approach to conquering Earth. The plan proves ineffective, though, as their motive is quickly discovered. After a brief power struggle amongst the Xilien ranks, their plan shifts. The monsters are unleashed once more, but flanked by legions of their own ships. Kamacuras is dispatched to Paris, where it encounters Eclair once again. However, the Xilien fleet takes out the giant war-machine, allowing Kamacuras free reign over the residing city.

With the world quickly being laid to waste, humanity finds itself out of options. So, using the Gotengo, Godzilla is unleashed from his artic confinement in hopes that the King of the Monsters will do battle with the alien invaders. Eager to continue his fight with the Gotengo, Godzilla follows the ship as it slowly leads him toward the Xilien Mothership. The Xilien's, after witnessing this new development, formulate a backup plan and dispatch monster after monster to defeat nuclear leviathan. After defeating both Zilla and Kumonga, Godzilla arrives on the shores of Kanto, Japan, where the Xilien's have left Kamacuras to wage war with the nuclear behemoth. Ready to do battle from a nearby bridge, the structure is, however, destroyed by the tidal waves advancing in front of Godzilla. The giant mantis quickly flies off, and disguises itself by matching the appearance of the hillside. The King of the Monsters is unfazed by the trick, and nukes the hillside to smoke out the large insect. Kamacuras leaps forth, just in time to dodge Godzilla's ray, and readies itself to engage its opponent in close combat. However, Godzilla throws the giant mantis away, causing the creature to tumble backwards and fall onto an electrical transmission tower. The tower pierces through the creature's exoskeleton, as its eyes begin to dim and death overtakes it.