File:BrainRobot.gif The Brain Robot is a Super Rare large armored unit from the Aliens faction in Metal Slug Attack. Relative to its Metal Slug Defense incarnation, the Brain Robot has improved HP, firepower, and speed - as well as the addition of a stun effect to its special attack. Parts of the Brain Robot can be found in the Guild Shop (5 parts for 500 guild medals). It can also be found in the Extra and Rare Shops, being sold in sets of 2/3 for 80/120 medals respectively.