|“||I make it my business to keep informed, darlin'. Everybody pops into the ranch from time to time. Everyone needs something from ol' Geryon. Now, Mr. di Angelo, put that ugly sword away before I have Eurytion take it from you.||”|
–Geryon, in The Battle of the Labyrinth.
Geryon is the son of Chrysaor and Callirrhoe and is the grandson of Medusa. He was a fearsome giant who dwelt on the island Erytheia of the mythic Hesperides in the far west of the Mediterranean. A more literal-minded later generation of Greeks associated the region with Tartessos in southern Iberia.
One of Hercules' twelve labours for his cousin, the high king Eurystheus was to steal some of Geryon's red cattle. When Hercules goes through Geryons territory, he meets his two headed hound Orthrus and his rancher Eurytion. They try to kill Hercules but he kills them instead. This angers Geryon as it is hard to find servants in his territory. Enraged, he attacks Hercules who smashes a club onto his chest. However, Geryon's wound promptly healed. Hercules soon figured that Geryon could only be killed if all of his hearts were shot through at once. Hercules draws an arrow and shoots it through all three of Geryon's bodies, killing him.
Geryon owns a two-headed hound named Orthus, which was the brother of Cerberus, and a herd of Apollo's magnificent red cattle that were guarded by Orthus, and a herder Eurytion, who was a son of Ares. Geryon is the owner of Triple G Ranch, with Orthus guarding the ranch. On a tour at the Triple G Ranch, they found out that he doesn't care about the animals, only his money. He gave Percy Jackson an impossible task; to clean out the stables of carnivorous horses which was also one of the tasks Hercules did. Once Percy completed the task Geryon went back on his deal to let his friends free and the two fought. Percy found Geryon a worthy opponent as he was a challenge due to his three hearts which allowed him to be almost impossible to defeat. Geryon had quoted that he had three hearts, "the perfect backup system." Percy defeated Geryon with a well placed arrow (later revealed to be thanks to Hera) that went through Geryon's sides hitting all three hearts at once, thus killing Geryon. Eurytion later takes control of the ranch, telling the demigods that Geryon won't reform for at least a hundred years since he's slow at reforming. Percy mentions that with the changes Eurytion is going to make, when Geryon returns, he will be serving Eurytion rather than the other way around.
As revenge for his defeat at the hands of Percy, Geryon cursed him to perish in the same manner as he had. In Tartarus, after Percy killed an arai, he was inflicted with pain on both sides of his chest. The arai informed him of Geryon's curse after his defeat, causing Percy to remember the events in Texas.
Upon reaching the Doors of Death, Percy spotted Geryon awaiting his turn to return to the mortal world. However, Percy and Annabeth are able to seal the Doors of Death before Geryon can travel back through them, leaving him trapped in Tartarus.
Geryon is a cruel monster who is only interested in making money. To this end, he will betray anyone he comes across as long as there is someone with a better offer and tends to break laws that the gods themselves had created (such as killing Apollo's Cattle). He will also break any promise he makes, as long as he isn't held to accepting the terms. Geryon tends to be on the lazy side however, as he will make Eurytion do all the hard work instead of doing things himself. When forced into combat, he relies on his ability to regenerate as long as all three of his hearts are working. This makes him somewhat overconfident in his own abilities and lead to his defeat by Percy.
Geryon was often described as a monster with human faces. Geryon had one head and three bodies with a total of two arms. Some accounts state that he had six legs as well while others state that the three bodies were joined to one pair of legs. Although there are some mid-sixth century Chalcidian vases portraying Geryon as winged, it is not known whether Geryon had wings: it seems unlikely. Apart from these strange features, his appearance was that of a warrior.
In the book, he is described as having a normal head. His face was weathered and brown from years in the sun. He had slick black hair and a pencil-thin mustache. He had two very beefy legs, wearing a very large pair of Levis. Each of his chests wore a different colored shirt: green, yellow and red.
Being a monster, Geryon is very hard to kill unless facing Celestial Bronze, Imperial Gold, or Stygian Iron. Even with these metals, his ability to regenerate allows him to tire out his opposition instead of fighting them head on. Because Geryon has three torsos, he also has three hearts which means he can not be defeated unless all three of his hearts are destroyed at the same time. Destroying one or even two at a time will weaken Geryon, but he will reform within moments. However without this ability, he isn't very strong and can be easily defeated.
- When cooking he wears an apron on each chest, with one word on each, together they spell "Kiss - The - Chef."
- He also sold Giant scorpion type monsters to Quintus for Camp Half-Blood.
- He supplied the Titan Army with meat illegally, as some of the animals were endangered species.
- He likes deals, and described himself as "a business man."
- He is the third one who has excessive body parts to be met by Percy Jackson and his friends in the Labyrinth: first is the minor Roman god, Janus with his two faces, and second is Briares, the Hundred-Handed One.
- Being the grandson of Medusa and Poseidon, that would make Percy his uncle.
- Eurytus says that it should take him about a hundred years to reform under normal conditions.
- Despite this, he was shown to be reformed after only two years. However, this could be because of Gaea's interference.