No. Just no. Go and sit in the corner and think about what you've done.
Modern Warfare is meant to be a ( fairly ) realistic game, so that means no aliens, no dudes with balaclavas on fire, and no lazer guns. If you want that, go play Fallout 3. And even if you don't want that stuff, because it's a great game.
Are you like 5 years old or something??