Call of Duty: Ghosts is getting its first DLC map pack on January 28 (for Xbox Live players). In addition to four new maps and a new weapon, Onslaught comes with the first of four new chapters for Extinction mode.

This installment of the alien fighting cooperative mode will bring players to Alaska. Specimens were smuggled to a research lab, but they were still alive.

Players will have to team up to defeat the horde, learn more about where the monsters come from, and figure out how to survive. For more on Call of Duty: Ghosts’ Onslaught DLC, check out our rundown of the four new maps.