When Perseus was born, his prophecy was to kill his grandfather King Acrisius. Because of this, Acrisius trapped Perseus and his mother Danae in a chest, and threw them into the sea, to die. A fisherman named Dictys heard their cries and rescued them soon later. Perseus then grew up on that island to become a strong, brave young man.
Meeting with a Mentor
Polydectes pretended he was marrying a princess other than Danae, so he asked each wedding guest for a gift. Perseus was too poor to buy a gift, so Polydectes told Perseus to go get the gorgon Medusa's head. Polydectes gave Perseus this challenge to get rid of him because he believed it would be impossible for anyone to complete.
Crossing the Threshold
Perseus promised to get him Medusa's head, though he was reluctant to believe in himself. He believed that one person alone could not achieve such a task. Perseus was by himself confessing his insecurities, then the goddess of knowledge Athena and the god of flight Hermes heard his speech.
Test, Allies, and Enemies
Athena gave Perseus a shield of brass to see Medusa's reflection so he would not look at her directly and turn to stone. Then, Hermes flew down and declared to be his guide to the island of the Gorgons. He also gave Perseus an unbreakable sword, to break through Medusa's snake-like skin.
Hermes led Perseus to the Gray Women in order to find the nymphs of the north. The nymphs then gave him winged sandals, a magic wallet, and a invisible cap to hinder the gorgons from seeing him. Perseus then convinced himself that he had enough help and resources to fulfill his promise.
As Perseus moved closer and closer to the gorgons, he noticed all of the animals that they have turned to stone. Perseus was now hovering over his enemies, the three gorgons, but was confused on which one was Medusa. Athena then whispered in his ear that Medusa was the one in the middle, and to attack while she was still asleep.