Some copies of Call of Duty: Black Ops 2 have Mass Effect 2 on the second disc

How did they manage this?
Gamers on the Steam community forums, Reddit and the Call of Duty forums are reporting that when they try to install disc 2 of Call of Duty: Black Ops 2, they instead get Mass Effect 2. So that’s what Treyarch meant when they said they were adding moral choices to the campaign.

Exactly how an EA game ended up in an Activision case is uncertain, but it’s possible the two publishing giants contract the same company to produce discs, and there was a disc image mixup at the factory.