As players fight through the hordes of Urzikstan in Modern Warfare 3: Zombies, they'll need to efficiently work through contracts to earn essence to buy the most valuable upgrades in the game, like Pack-a-Punch level III. Of the eight contracts available in the first ever Call of Duty: Zombies experience to hit a Modern Warfare installment, veterans of the zombies mode may recognize the Escort contract from Call of Duty: Black Ops Cold War's Outbreak modes mission of the same name.