In this episode we find out how Slimer became their pet ghost. Also we find out about the different coloured uniforms and the new containment unit.
It takes place after the end of the first movie. The ghostbusters arrive home after fighting Gozar. Egon tells the rest of the ghostbusters to get rid of their old uniforms because of a build up of PKE. Egon puts Peter in charge of destroying the old uniforms but Peter being his usual lazy self doesn't, he just hides them behind the new containment unit. Slimer starts to show up more often in the firehouse. Egon asking why and Janine tells him she thinks he's there because they were the only people to pay attention to him. All the ghostbuters except Peter start to grow friendly towards him. Then eventually the old uniforms PKE builds up and turn into ghostly versions of the ghostbusters. The ghostly versions want to become the only ghostbusters so they try to destroy the real ghostbusters. The ghostbusters figure out the only way to defeat them is to make them use their energy. Slimer saves the day by drawing their fire weakening the evil ghostbusters until they're drained. Thus Slimer saved the day.