One unlucky Call of Duty: Modern Warfare 3 Zombies player attempts to exfil at the final helicopter, though a frustrating glitch ruins the attempt by destroying it completely. The popular Zombies mode, once a staple of Treyarch developed Call of Duty titles, has now become a core pillar for the franchise in general. The Zombies experience returned to Modern Warfare 3, though it brought with it a number of major changes from what longtime fans had been used to.