"The world changed the day the rifts opened." Captain Alex Mercer and his team in MTF 1 are among the elite tasked with safeguarding humanity from the invaders and alien creatures spilling through rifts. As Earth teeters on the brink of chaos, ancient Roman legions, invader factions, and rogue paramilitary groups vie for control of the alien artifacts, magic, and power that could reshape entire worlds. The rifts are just the beginning.