Episode Title:Slimer's Sacrifice.Episode Description:Slimer accidentally becomes trapped in the Containment Unit and the Ghostbusters are being picked off one by one by an aggressive dog-like monster called Fenris. Eduardo decides he must save the green spud by travelling into the Containment Unit, leaving the others to stop the demon god Surtr's plot to bring about Ragnarök. (Several older monsters appear, most crucially the Siren and Banshee - the former implied to be at risk of assault if she doesn't follow Surtr's commands)