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
Legend of Dinosaurs & Monster Birds from the shark attack movie "Jaws" (1975) as well as other animal attack films being released in the US. Also, in Scotland, interest in Nessie at Loch Ness was gaining worldwide attention at the time. In the spring of 1976, an early title for the screenplay was written called “The Giant Monster Bird vs. The Giant Dragon God" (大怪鳥対大竜神, Dai kaisho tai Dai ryujin). "Legend of Dinosaurs & Monster Birds" was filmed at Toei Studios and on location at Mt. Fuji. The production cost of the film was (), equivalent to adjusted for inflation. "Legend of Dinosaurs & Monster Birds"