Link and Bob had to clean up the place and they thought they might be able to clean it up faster if they had a ton of zombies helping them. Now they need to put the zombies back and clean up more of a mess than when they began and they need your help to do that. You get to choose the character you would like to use after each wave of zombies. Also, be sure to look for things that pop up in the room. These things can help you. For example, a picture of one of your allies might pop up and you can shoot at it to get that alien or person to show up and help you for a limited amount of time.