It's Christmas on the Riverbank, and Hammy and Martha and GP and Turtle set out to find a tree and decorate it and make presents for each other. But a mysterious stranger steals the tree and they find it back in the woods near a cave. A monstrous voice and a shadow on the cave wall frighten them off, but they find the monster is a lonely little Gerbil called Humbug, and they win him over by sharing their Christmas with him.
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Ready to Watch Once Upon A Hamster, Season 4, Episode 52?