In the future, a star-faring race called the Sventii, convinced of their own superiority, have conquered and subjugated every race they've encountered in our galaxy. When they come to Terra (Earth), they do so fully intending to enslave or annihilate mankind and use the planet's resources, leaving a dying husk behind. Their advanced technology decimates all of mankind's defenses.

With billions killed in the first year and a half, mankind's last hope is all but gone when a remarkable discovery is made. The Nexus Graft gives mankind the ability to mentally communicate with animals. This allows the formation of battle groups, led by an experienced military officer and made up of a select group of animals. These primitive assault groups are completely ignored by the energy shields and advanced technology of the Sventii.

Now there is renewed hope for mankind's guerrilla-warfare offensive strategy against the Sventii! Battle Group Undaunted, move out!