Eliminate the invading force intent on taking Space Station Xorbe in Earth's orbit. If the station is captured then it'll become a staging ground for the invasion of Earth itself. You got a huge arsenal of weapons and defensive mechanisms to stop them.
Try to stop the space corporation by putting an end to their evil experiments on mutants. Choose a character and unlease your electric skills on countless number of enemies.
Defend your city against Your enemy. You must raise and train your shooters and build improvements in your city and power. Be sure to spend your money wisely.