Apocalypse - Call of Duty: Black Ops 2 Wiki Guide - IGN
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Call of Duty: Black Ops 2 video previews and delves into 'Apocalypse' DLC, new maps and Zombies - Call of Duty: Black Ops II Forum (CoD: Black Ops 2) - Neoseeker Forums
Call of Duty: Black Ops 2 – Apocalypse DLC Review
Co-Optimus - News - Black Ops 2 'Apocalypse' DLC Releases on Xbox 360, Latest Patch Notes Outlined