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You are able to buy "The Grim Adventures of Billy and Mandy - Season 3" on Apple TV as download.
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Billy, Mandy and Grim dig up loads of schemes to make their lives better, or so they think. Billy borrows Grim's special hair tonic and winds up being mistaken for Sasquatch. Mandy joins the Secret Snake Club and calls on an ancient snake god to protect the dweebs. Then the threesome heads to Sassycat Land to discover the real reason why the futuristic House of Tomorrow is closed for eternity.