Jack and the Swamp Wizard

Jack meets a swamp hermit who guides him to the three gems of Cronus, which can take him home, but the hermit is Aku in disguise, who uses the gems to resurrect Cronus. Jack reveals he knew of Aku’s trick, having already snatched a gem, which destroys Cronus. Aku tries to use the gems against Jack, who shatters two and secretly keeps the third.