Here's one-
A lone man, stranded in the middle of a desert, wandering for days in search of food and water, when he stumbles into a long abandoned base, and when looking for water he accidently releases experimental aliens that were sealed in the base hundereds of years ago, so he makes a mad dash to the armory only to find all weapons gone or used up, all but one pistol.
Later, when he fights about half of the alien freaks, he encounters a lone survivor and ass what happened there. The man tells him that this place was an experimental facility built by the military hundreds of years ago.
When the man is almost told the secret of the base, a large hint about he mother of the freaks who ends up being the spawn of all the people and men in the base put together in a voilent, bloody mess, he is slayed by a sigle slice of a sneaky alien's tail. Soon, the hero is fighting his way out of the base, encouter's the big mother alien, defeats it, get's to the hangar, flys off in a sole airplane, and comes home, only to fimd that he was taken for dead, and with tat, he becomes a lone wolf, not ever being any one's friend, and everyones eney. (end game at this point)
Wow- thats alot, isn't it?