These giant contraptions are defense drones used inside the Rugname. They attack by dropping bouncing bubbles from their bellies similar to an oversized Drop Shot. When defeated, the body disconnects from the legs and crashes onto the ground crushing anyone underneath it.
|Mars Mecha: The original giant Martian walker mech.|
|Mars Professor: The Professor's personal Mars Mecha customized to shoot out plasma bolts from its antennae. Appears in Metal Slug Attack.|
|Cocoon Betty: A variant of the Mars Mecha piloted by Clone Betty. The bouncing bubbles it generates can make solid blocks of ice to stop advancing enemies. Appears in Metal Slug Attack.|
|Golden Mars Mecha: Another variant of the Mars Mecha, piloted by a Martian. Everything is painted gold, and it can also generate bubbles which spawn young Hopper Mechas, who are just as volatile as their golden counterparts. Appears in Metal Slug Attack.|
- The Mars Walker is based on the H.G. Wells War of the Worlds Tripod, and sports the iconic Heat Ray emitter from the 1953 film.
- Metal Slug 3 Japanese concept art