An unknown army has invaded humanity. The government calls forth Bill Bizer, the savior of mankind during the alien wars. Guide Bill and his partner Lucia through action-packed battles against alien hordes. Pit Bill against his ex-partner Lance Bean, who has defected and is now the evil mastermind behind the alien aggression. Massive, screen-filling boss characters do everything they can to keep you from proceeding through the multiple action-packed missions, while environmental threats such as swarms of bugs, aggressive enemies, and alien encounters keep you on your toes.