Cowboy Bebop: The Movie

Mars is under siege! Just before Halloween 2071, a terrorist bomb destroys a tanker truck on Highway One, close to a densely populated crater city. There are casualties up to half a mile from the blast.

500 killed or injured by what appears to be a biochemical weapon. The rewards for the bombers capture is massive and there are four humans and a dog who really need the money.

Down on their luck...