‘’Shadowmaster is the one hundred twenty fifth episode of ThunderCats (original series)
From the Shadow Realm, the Shadowmaster contacts the Ancient Spirits of Evil, telling them of how he captured Lion-O's father, Claudus, just before Thundera blew up. Telling them that if they free him from his imprisonment. he will use Claudus to end the young Lord of the ThunderCats life. The spirits think over the idea, then decide to test him before freeing him.
Then the Shadowmaster, through a nightmare, 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. Mumm-Ra meanwhile, feeling like the Ancient Spirits of Evil will turn against him in favor of the Shadowmaster, sends Ma-Mutt to secretly steal the sword from the bat and put it back near the book. This proves crucial to Lion-O's triumph in battle.
Once the Shadowmaster is defeated, Lion-O and Claudus escape. Lion-O tries to take his father back to Thundera but can't do to Cluadus's advanced age. So Cluadus turns into a spirit like Jaga and the pair are reunited. Mumm-Ra is pleased at the Shadowmasters' failer, but pretends to wish to offer him assistance. The Ancient Spirits of Evil tell him to leave the man to his fate.
- Main Characters
- Guest Characters
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