Escalation is a downloadable content pack (DLC) for the 2010 game Call of Duty: Black Ops. It includes four new multiplayer and one new zombie map: - Zoo (takes place at an abandoned Soviet zoo) - Convoy (takes place near an abandoned convoy containing a big missile) - Hotel (takes place in a resort in Cuba) - Stockpile (takes place in a small village in Russia, with one of the houses containing a stockpile of weapons) - Call of the Dead (the zombie map, taking place in an abandoned Siberian outpost near the coast)