Alex is able to stop Menendez from controlling the drones with the aid of his son David Mason and other significant individuals, preventing a global catastrophe. Another conclusion, known as the "Bad Ending," has Alex failing to stop Menendez, resulting in extensive destruction and the demise of important individuals.

Call of Duty: Black Ops II All 8 Endings (Best, Bad, Worst, kill/Spare Menendez) - YouTube.

The Entity\n\n The Cosmic Entity might be the most powerful Supernatural monster in history, but there is not enough known about it to rank it very high on this list. The Entity predated God, the Darkness, and Death. However, the full power of the Entity is unknown, as we still don't know what its specific powers are yet.

The song that Dean is humming to calm himself down on the plane is called "Some Kind of Monster" by Metallica.