For too long genetically modified grown food and pollution from the ocean and environment created a harmful impact on the natural food chain of Planet Terria. The insects and ocean dwellers mutated in wildly unusual ways and became stronger and more intelligent. Some began to develop brain abnormalities, which resulted in an increased aptitude of 5000% in their IQ’s. As their new intellect grew, so did their appetite for planet domination. They now feel that Terrians are their Public Enemy Number One. So, they developed a secret army and are now ready to eradicate the Terrians with all of their mutant force. You and your ship, the "Kai-jin" are the last hope for the Terrian Kind. With Kaijin’s powers at your disposal, you must annihilate the baddy bugs with your lasers, fireballs, homing smart bombs and devices.