When Poseidon arrives on Olympus in search of a cure for his sick hippocamps, Demon is pretty fed up. How will he breathe underwater - and what in Zeus's name is a hippocamp anyway? With his magical medical box Demon cures the sea horses' scale-rot, but then Helios orders him to the Stables of the Sun. One of his Celestial Steeds has gone lame and Demon's about to get caught in a feud between fire and water...