NeoGeo Metal Slug 3 Mission 4- Tombstone of Sand

The heroes' next stop is infiltrating a Rebel facility located inside of an ancient pyramid. During the raid in the desert, several Rebel soldiers are seen escaping the ruins from a mass of flying spores in the air. These spores quickly grow into man-eating plants and take over the place. Various mutants from Pallas Island are also seen underground alongside new deformed creatures. This raid disturbs a whole array of mummies from their tombs. To the surprise of many, an active army division from a war that ended ages ago have taken refuge here and held some soldiers as prisoners.

This complete mayhem angers an ancient guardian protecting these ruins and starts attacking everyone on sight. The final part of the mission is to eliminate it before it does any more damage.