Who is Hayley Foss from The Game and what is their importance?

Hayley is a young girl, who has lived a very sheltered life under the rule of her strict grandmother. Hayley is the daughter of Merope (one of the astronomical seven sisters) and Sisyphus (Cyrus Foss) a former king of ancient Greece. It is prophesized that she has the power to stop her cruel, power-hungry uncle Jolyon from his dictatorship over the rest of the family. She turns him into the planet Jupiter and frees the family from his tyranny. Hayley's name is a reference to Halley's Comet.