ThunderCats 1985 Season 4 Episode 15 Shadowmaster Episode Title:Shadowmaster.Episode Description:From the Shadow Realm, the Shadowmaster contacts the Ancient Spirits of Evil, telling them how he captured Lion-O's father, Claudus, just before Thundera blew up. The Shadowmaster, through a bad dream, shows Lion-O his captured father and challenges Lion-O to a fight. Lion-O goes to the Shadow Realm through the Book and Sword of Omens, and is able to fight the Shadowmaster as long as the Sword stays bonded to the book. However, the Shadowmaster sends a huge bat to steal the Sword. It succeeds, and then Lion-O becomes very weak in the Shadow Realm...