"The world changed the day the rifts opened." In the year 2023, Earth is torn asunder by the sudden appearance of rifts—portals to otherworldly realms—that unleash devastating alien creatures, hostile factions, and ancient horrors. The Global Rift Response Agency (GRRA) is formed to combat this unprecedented threat, uniting the world's military, scientific, and technological resources in a desperate bid for survival. Among the GRRA's elite forces is Captain Alex Mercer, a seasoned soldier and leader of Mobile Task Force 1 (MTF 1), tasked with protecting humanity from the chaos emerging from the rifts.