http://img7.gram.pl/20090531134632.jpg
Image source: http://www.gram.pl/artykul/2009/05/31/retrogram-mdk.shtml

MDK is a 1997 third-person shooter video game developed by Shiny Entertainment for Microsoft Windows. It was ported to Mac OS by Shokwave, and to the PlayStation by Neversoft. The game tells the story of Kurt Hectic, a janitor who reluctantly must attempt to save Earth from an alien invasion of gigantic strip mining city-sized vehicles named "Minecrawlers". These Minecrawlers are removing all of earth's natural resources, and crushing any people and cities that get in their way. Aided by his boss, the possibly insane inventor and scientist Dr. Fluke Hawkins, and a robotic two-legged/four-armed dog named Bones, Kurt must infiltrate each Minecrawler, and fight his way to the pilot, whom he must then kill before returning to Hawkins' in-orbit space station, the Jim Dandy. -from Wiki

Gameplay:
https://www.youtube.com/watch?v=yFvlAuX65K8