If a zombified player gets hit in mid-air by an enemy zombie or by the boss, the player will explode just like how the other zombies do when killed.Interestingly, unlike the typical type of zombies most people are familiar with, zombies in the Metal Slug series do not attack by biting. Zombies are possibly based on the classic 'Romero' zombies as seen in films such as Dawn of the Dead.

Zombie Eri promotional art for the Midsummer Horror Night event in Metal Slug Defense. Note: All common zombies act the same, the only difference is their health, speed and toughness. Slow and individually weak, they can quickly gang up and overwhelm the player. Infected Survivors make up most of the zombie horde. In Metal Slug Defense and Metal Slug Attack, zombies are considered to be part of the Space Army with the exception of one zombie, Jane Doe, who is part of the Rebel Army. Zombified players can transform back to human form by obtaining a first-aid kit. Enemies killed using the blood wave don't give any bonus points from it. On the other hand, the advantages of zombified player are that they are immune to nearly all attacks from the Rebels, and their bombs are replaced with a deadly wave of bloody vomit which covers nearly the entire screen. Also, an attack from an enemy zombie or the level boss will kill a zombified player. As a zombie, the player's character moves much slower, jumps much lower, cannot crouch, and is restricted to their default pistol weapon. If the player is hit by a zombie attack, they transform into a zombie. POWs are not infected by any type of zombies' attacks. Fortunately, they are slow-witted, easy to outmaneuver, and often trip when fired at. They are significantly more durable than ordinary humans, with even the weakest able to withstand several rounds of fire before destruction. Zombies are slow-moving, clumsy enemies, but they can zombify any human, both NPCs and players, almost instantly with their infectious fluids. In Metal Slug 4, the boss of mission 4, Big John, is used by the Amadeus Syndicate to turn everyone in the area into zombies using its virus bubbles. In Metal Slug 3, zombies were once regular people, Rebel soldiers and researchers that are transformed by an unknown radiation emitted from the Monoeye UFO.

Metal slug 2 1 coin