Defeat Zakhaev is the final story mission of the Zombies campaign in Call of Duty: Modern Warfare 3. It features almost everything that players have been through on the main map and an absolutely giant boss fight.
How to Deploy to Zakhaev’s Stronghold
Similar to the two previous act-ending story missions, this one also requires players to exfil from a special location on the map in order to start the mission proper. The other two exfil locations are still on the map, but players should use the icon of a person running with a star labeled “Defeat Zakhaev.”