There are many secret missions that you can complete in Modern Warfare 3 Zombies, and one of them is The Shepherd Mission at the end of Act Two. We will be covering this mission and teach you how to complete all the tasks for the mission.
How To Complete All Tasks for Shepherd Mission in MW3 Zombies
The Shepherd Mission in Modern Warfare 3 Zombies is a secret mission that becomes available after you complete all the previous missions for Act Two of the storyline. You must complete this mission to initiate a cutscene and advance further into the Zombies storyline.