On the same day that Tom Dunn finds out that he is to become a father again, the people of Earth become plagued with terrifying visions of the end of the world. When a gigantic, all-consuming alien mothership launches a ruthless attack, chaos and destruction follow. The ultimate war for Planet Earth is about to begin...

After his career is destroyed, a brilliant but arrogant surgeon gets a new lease on life when a sorcerer takes him under her wing and trains him to defend the world against evil.