demigods, going against the wishes of Zeus as part of a plan to defeat Gaea. Her cabin in Camp Half-Blood is Cabin 2, the second biggest in the camp, but because she does not have demigod children, it is empty. In the film adaptation, Hera is played by Erica Cerra. Poseidon/Neptune – The god of the sea, earthquakes, and horses who is the brother of Zeus and Hades. In The Lightning Thief, he is suspected of having stolen Zeus's master bolt but is proven innocent after Percy recovers it from Ares. Poseidon fights Oceanus in the underwater front of the Titan war. He remains there in The Last Olympian while the other Olympians fight Typhon, until Percy convinces him that his power is necessary to defeat Typhon. He was last seen fighting the Giants in the Second Gigantomachy alongside Percy and the other gods and demigods and mentioned Kymopoleia to the other gods as his daughter after Percy and Jason reported meeting her. Though he is referred to as Neptune in the sequels of Percy Jackson and the Olympians when the Greeks and Romans are united, he has yet to appear in Roman form. His cabin in Camp Half-Blood is Cabin 3 in which Percy is the sole permanent occupant. In the film adaptation of The Lightning Thief, Poseidon is played by Kevin McKidd. In the musical, he is portrayed by Jonathan Raviv. Toby Stephens will portray Poseidon in the TV show. Demeter/Ceres – The goddess of agriculture, who appears alongside her daughter Persephone in The Last Olympian, where they participate in the battle against the Titans. Demeter's cabin in Camp Half-Blood is Cabin 4. In the film adaptation of The Lightning Thief, Demeter is played by Stefanie von Pfetten. Ares/Mars – The god of war who is the son of Zeus and Hera and the father of Deimos, Phobos, Eros, Clarisse La Rue, and Frank Zhang. Ares is a callous bully who is driven by either greed, aggression, violence or by the promise of violence. However, as Mars, he dislikes war without reason and is one of the more important Roman Gods. He is however still a bully and is all for killing the Greeks. Percy first encounters Ares in The Lightning Thief, in which he drives a black Harley-Davidson motorcycle with flame decals and a leather seat made from human skin. Percy defeats Ares in a sword fight