Three “ninjas” are loose on the city and committing robberies. The catch: they’re using a werewolf! The NYPD contacts the Ghostbusters for help just as the thieves hit the Natural History Museum, taking a mummy unearthed with King-Tut. The Ghostbusters face off with the wolf at the scene, managing to free it of the collar keeping it under the ninjas’ control. The Ghostbusters get a surprise when Irene, the werewolf’s human form, appears at their doorstep asking for their help!