Call of Duty: Vanguard will have a Zombies mode, made by Treyarch - Polygon

Call of Duty: Vanguard will get a Zombies mode developed directly by Treyarch, despite not being a Treyarch game. The Black Ops Cold War developer will pitch in for Sledgehammer’s entry in the series by creating new Zombies content for Vanguard.

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Call Of Duty: Vanguard' Zombies will include franchise first crossover

Breaking: Year 2 Updates announced and start tomorrow for Cold War! Only a new weapon drop for zombies. I wouldn't expect massive content drops like chronicles 2 for year 2 but who

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Treyarch Is Making CoD Vanguard's Zombies Mode

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Element 115, Call of Duty Wiki

Call of Duty: Vanguard' Drops First Look at Zombies Mode from Treyarch Studios – The Nerds of Color