Developers Infinity Ward and publisher Activision have released a brand new Call of Duty: Ghosts cinematic trailer serving as an introduction to the mysterious new alien defense mode, Extinction.

Earlier, the studio launched a more action-packed gameplay trailer of the mode which you can check out right here. Now, find out how us humans first discovered this new alien threat.

[youtube id=”edp3Fb3Zcck” width=”618″ height=”378″]