The Wall Crawler is the third boss of Metal Slug 5.
This is a special unit created by the Ptolemaic Army. It can climb any building with ease and also demolish the building with its sonic cannon.
The Wall Crawler's main attack consists of firing three shells from its cannon at the player that can be ducked or jumped over. It will also fire a series of rockets or use its powerful sonic cannon to shatter the floor the player is standing on. Once in a while, the operator will get out of the unit and call in Bazooka Guerrillas from the bottom floor.
- The Wall Crawler (and the entire third mission) is listed as the first boss/mission in its official concept art and the game's debug level select.
- The commander inside the Wall Crawler has an unused animation where he is presumably seen punching or throwing something.
- Concept art shows Special Forces soldiers coming out from the Wall Crawler's bottom hatch. Ptolemaic infantry in the game arrive from inside the building instead.