Earth is dead. Mankind annihilated. Hunted to extinction by a century of alien attacks. One last, desperate chance remains - CHANGE HISTORY. Someone must travel back in time and attack the alien predators before they complete their hideous invasion. Genetically enhanced marine, Adam Drake, must make the trip into the far reaches of Earth's history. His goal - stop the alien body harvest... Travel with Adam Drake through 5 incredible levels of action-packed adventure, spanning more than a century of Earth history!