(Don't know what happened to my other post, but I swear I created one for Bill and I already.....)
Desolate planet, and eachothers 'alien' has landed there, and are surveying the planet for colonisation of one anothers alien race.
Our Aliens have bumped into eachother (as you do), and decided to fight it out to the death!
1 full colour image in style of own choosing, and as many extra suggestive sketches as you like.
Bill - how's it going?