The Battle of the Labyrinth camp for the school year. On his fifteenth birthday at the summer's end, Percy receives a visit from his father Poseidon, who gives him a sand dollar, admonishing him to “spend it wisely”. Nico later appears to tell Percy his plan to defeat Luke once and for all. "The Battle of the Labyrinth" was initially referred to as "Percy 4" until the title was officially revealed. The novel was teased by Rick Riordan behind the pages of its predecessor, "The Titan's Curse". It was based on the Greek myth of the labyrinth, where the Minotaur was supposedly kept. In his
Return to Labyrinth the making of and commentary on the DVD release of "Labyrinth". Another book at the Ministry is titled "Legend of Dark Crystal", referring to Tokyopop's 2 part Manga series "Legends of the Dark Crystal" based on the Jim Henson film. Toby's Philosophy teacher, Glosspan, is a reference to the character Pangloss from "Candide" by Voltaire. In Toby's flashback, Sarah reads the phrase "When the Wizard awoke, the six colored suns were shining..." which is from "Dorothy and the Wizard in Oz". Cob the Exile's tiny robot, Mandelbrot, addresses Jareth by saying, "Please state the nature of the medical emergency," a