At the conclusion of The Mark of Athena, Annabeth and Percy tumble into a pit leading straight to the Underworld. The other five demigods have to put aside their grief and follow Percy's instructions to find the mortal side of the Doors of Death. If they can fight their way through the Gaea's...
Percy Jackson: Son of Poseidon/Neptune. Has ability to control water, talk to creatures of the water, does well on ships, etc. Camp Half-Blood leader in the Percy Jackson and the Olympians series after he defeated the Titan Lord Kronos. Went missing and his memories were taken by Hera/Juno, reunited with friends at Camp Jupiter.
Annabeth Chase: Daughter of Athena. Super wise, clever, and smart in battle. Only one to find the Athena Parthenos on the Mark of Athena journey. Loves Percy Jackson.
Leo Valdez: Son of Hephaestus. Can manipulate fire in his hands. Is supreme overlord/commander of the Argo II.Designed the Argo II using his robotic dragon Festus. A whiz with machines, not so much with the ladies.
Jason Grace: Son of Jupiter/Zeus. Brother of Thalia Grace. Can control lightening and winds. Also suffered from memory loss because of Hera/Juno.
Piper Mclean: Daughter of Aphrodite. Can use charmspeak, the ability to make people do what she wants just by telling them something. Loves Jason.
Frank Zhang: Not only a son of Mars, but also can shape-shift into any animal. Befriends Percy when Percy is sent to the Roman camp. Is Chinese-Canadian.
Hazel Levesque: Daughter of Pluto/Hades. Can control jewels, has super-sense underground. Died with her mom in the 1940's to stop Gaea from returning. Nico found her in the underworld and brought her back to life in modern times. Also befriended Percy. Is half-sister to Nico.
Nico di Angelo: Son of Hades. Can control the dead, is powerful camp; knowledgable in the Underworld. Lost his sister in book 3 pf the Percy Jackson camp; the Olympians series. Also is from an earlier period, but is in modern times because Hades stuck him camp; his sister, Bianca, in the Lotus casino to bypass the big three pact. Is aboard the Argo II. Hazel is his half-sister. 13 years old.
Festus: Giant metal dragon Leo found in the forest and later repaired. Festus's head is currently the front of the Argo II.
Mr. Brunner / Chiron: Percy's teacher and mentor at Camp Half-Blood. He is the legendary mentor of Hercules.He transforms into a centaur. He also helps Percy, Annabeth, and other demigods at Camp Half-Blood.
Coach Hedge: "Chaperone" of the quest. Satyr, a half-man, half-goat. Adores Dionysus/Bacchus, god of wine and pleasure. Likes to keep order with a baseball bat.
Gaea: Main enemy: allows giants to rise out of Tartarus attempting to awaken herself. Mother of all monsters. Powerful asleep; deadly when awake.
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