In the game you play as Cryptosporidium 137 (Crypto for short) an alien from a race known as Furons sent to Earth to collect human brain stems which contain pure Furon DNA and to Destroy All Humans! There has been a lot of alien games but Destroy All Humans! has to be the best of them all! This game has everything you go round killing people, flying in a flying saucer, disguising yourself a human, picking up vehicles, humans and animals with Psychokinesis (PK for short) its an awesome game and Destroy All Huamns! 2 is just as good and I love it how Crypto sounds a lot like Jack Nicholson and Pox (his full name is Orthopox) is an great character as well go by the game NOW!