Destroy all Humans! Rocks on!
He is part of the devious Furon empire ( a whole bunch of 4 foot tall grayish blue dudes with phsychokinetic powers and atomic weaponry) and is commisioned by Pox the commander of the mothership. He is assigned the task of investigating the sudden loss of Cryptosporidium 136 and once the task is performed to destroy all humans.
He is given the basic weaponry at first ( the Zap-O-Matic) on the ground and in his terrifying saucer ( the classic Death Ray ) and starts on a turnip farm and tries to interrogate a paddock of cows.
As the game unfolds you'll get more effective weapons to eradicate the human race such as the Brain Bug for the ground and the Quantum Deconstructer in the air. They are very destructive but once compared to the Majestic A.K.A The G-Men you should duck for cover.
If you desire to use the DNA you acquired by using the Anal Probe
or using your mind powers to extract the brain stems you can juice up your telekinesis or your weaponry or the weapons in your Flying Saucer of Terror.
After playing the story mode you can still go in and have fun by terrorizing the "Puny Earthlings" using your supiorior arsenal and eraticating vast amounts of earthlings providing endless gameplay and fun to enjoy. If that doesn't satistfy you and you like finding secrets then you can explore the terrain of the 6 vast areas and find the many Furon Probes
(floating spiderlike robots) that cover the areas.
This all will probally provide gameplay for a few weeks making Destroy All Humans! the ultimate must have.