In Mission 2 of Metal Slug 3, the survivors are dazed and injured passengers of the plane that went down over the quarantined area of the Monoeye UFO's crash site. In addition, a team of scientists were conducting research in the area, but were forced to flee when the zombies attacked. The Rebel Infantry, who arrived at the site before the heroes, have also witnessed some of their members being turned into zombies as well.
The survivors are also found in Mission 4 of Metal Slug 4 along the upper path. This time, they are visitors and staff of the amusement park when it was attacked by the Amadeus Syndicate who used an amusement park robot, Big John, to turn everyone in the area into zombies.
In the games, the Zombies use their infectious fluid on the survivors and turn them into one of their own. One by one the survivors will join the legions of undead, unless of course the player can stop the advancing zombie hordes before they have a chance to assimilate more survivors. Of course, the player can also turn into one if they're contacted with the zombie's fluid.
Types of Survivors
|Man: This man's arm and leg are injured, but still can limp across the ground. If turned into a zombie, he will vomit into his cupped hands and then hurl it at the player.|
|Fattish Man: This elderly man has a bleeding stomach injury and can't walk. If turned into a zombie, he will launch infectious fluid by opening his rib cage.|
|Woman: This crying woman does not have any injuries visible to the camera, although she may have hidden leg injuries, as she can't walk. If turned into a zombie, she will vomit directly at the player.|
|Young Man: This man's shoulder is injured, and he can't walk. If turned into a zombie, he squirts infectious fluid from his brain cavity by squeezing his head.|
|Scientists: These scientists were sent to the Meteor Crash Site. However, they were unaware of the Monoeye UFO's ability to turn people into zombies. Scientists are seen at the beginning of the mission, fleeing in terror, while zombified scientists are found closer to the Meteor Crash Site. Zombie scientists use their intestines as a kind of "hose" in an attempt to spray infectious fluid at the player.|
|Fake Zombies: They are employees at the amusement park and are completely harmless. Some fake zombies roar at the player; others are seen running from the zombies. If they turned into a zombie, they attack the same way as the Zombie Man.|
These types of survivors have been already zombified. Zombies never attack the human Rebels in any capacity.
|Rebel Infantry: The Rebel Army arrived at the Meteor Crash Site well before our heroes. Unfortunately for them, several of their soldiers were turned into zombies, which are encountered near the end of the mission. They attack by leaping onto the player, exploding upon contact with the ground or the player.|
|Tar Man: These are possibly the survivors of the plane crash near the Monoeye UFO. It attacks by throwing a wide spread of zombie fluid with his hands. When situated above his victim, he can also fall onto his victim and explode.|