A City is hit by an alien Invasion. The Hero must fight off the invading Hordes ... but is everything as it seems?

This is a movie opening sequence, based on the novel "The Invincible" by Stanislav Lem

Earth - The Future. The whole Planet has turned into a Desert where no life is possible. Two rivaling treasure hunters are on the search for long lost valuable items. One of them is utterly unsuccessful, the other is like a Hero. Now they discover the most valuable treasure of all times ... a living