Zombies are the banes of Mega City, that only the busters can fight. There are many types of zombies, and they can be found in the game modes Zombie Survival, Boss Battle and Zombie Infection. In the first two, all the zombies are NPCs (Non-Player Character or Non-Playable Character). However, in Zombie Infection, which is a relatively new game mode, all the zombies are PCs (Player Character or Playable Character). The group of NPC zombies and the group of PC zombies are distinct, that is, every type of zombie is either a NPC type or a PC type, but not both. However, for each PC zombie type there is a NPC zombie type that is very similar by looks and somewhat similar by moves.