Modern Primitives / Giant Billy and Mandy All-Out Attack

S5, E3: "Modern Primitives" Billy discovers a modern stone-age caveman buried in his front yard. Will the Neanderthal ascend the evolutionary ladder and blend in with modern society? Or will he snap and go on a berserk caveman rampage? "Giant Billy and Mandy All-Out Attack" When Billy and Irwin want to see giant monsters fight, Grim risks Mandy's wrath to transport the boys to mystical Japan.