In the year 2025, the telepathic monster Broodmaster Magnalux has made a base on Earths moon. As the human player, you must alert humanity to the threat, and rally navies, armies, and air forces against the alien menace. As the Broodmaster player, you must subvert the Earth, using your mind control to gradually take over Earths most vital defenses.

Invasion of the Brood is a two-player strategy game, in which the two sides have greatly different abilities, strategies, and even turn structures. Will humanity come together to stop this alien invasion, or will the sinister Broodmaster take over the world? You will decide!