The Underworld usually isn't anyone's idea of a fun place--except for Hades. He loves the dark and even the stinky smell of sulfur! But there is one thing that Hades is not a fan of...dogs. And when Zeus and his fellow Olympians encounter Cerberus--a mean, snarling, three-headed dog--Hades must conquer his fears and tame the dog in order for everyone to continue on to the Underworld and drop off their Titan prisoner, Oceanus, back where he belongs!