Leo, Tia and Mr. Peabody pack their bags, off to a super assembly of all the super-secret clubs from around the world, including: the Ugly Slipper Knitting Group, the Stinky Cheese Collective, and the Imaginary Paleontology Society. The assembly is hosted by the Guild of Black Pudding Admirers — but there’s something very odd about its pale, pointy-toothed chairman. Is he . . . a vampire?

But Count Forelock isn’t the only frightful foe Leo and Tia are about to face. A sticky villain from the past is back, along with a galactic threat so big, the Earth itself is at risk!