One of the lesser pawns in the Xiliens' plans for domination, Ebirah was unleashed to destroy an oil refinery just outside of Tokyo in the initial onslaught. The Earth Defense Force attempted to stop this colossal crustacean, to no avail. Shortly thereafter, special soldiers were released, armed with advanced lasers. Performing acrobatic stunts, the troops managed to sever both of the monstrosity's claws. As they prepared to destroy the seismic shrimp's head, Ebirah disappeared.

The Xiliens, a mysterious alien race from deep space, revealed that they were responsible for Ebirah's disappearance, along with a multitude of other monsters that were attacking major cities across the globe. These extra terrestrials true intents were being masked, however, for it was the Xiliens who had actually released these creatures as a part of their plans for conquest. When the true intentions of these beings came to light, the monsters were unleashed once more. This time, however, there was one creature on Earth who stood in the Xiliens' way: Godzilla! Ebirah and Hedorah, the smog monster, were sent to Tokyo Bay, where they encountered Godzilla. They were forced out of the surf by Godzilla's atomic ray, and when he rose from the sea, the heroic reptile fired another beam at his enemies. As quickly as they had arrived, Ebirah and Hedorah were instantly annihilated...