Acrisius, a king, had a daughter named Danae. He know when she had a son he would be powerful enough to throw him off the crown, so he put her in a bronze underground apartment. When he got word that she was having a son named, Perseus, he put her and her son a wooden chest then sent them to sea.
by wind and sea they drifted to the island of Seriphus, where a nice fisherman by the name of, Dicty's, would give them mom and son a place to live.
As years passed and Perseus got older and stronger. Dicty's brother, Polydecets, was the king of Seriphus, he grew interested in Danae and her son. He asked her to marry him but she said no, since she was marring Zeus, he bullied her but was afraid of Perseus. He wanted him dead.
Polydecets told Perseus that he was wasting his talents on the inland and that he needed to go into the real world and be a hero. Persues didn't know how to become a hero but Polydecets did, all he needed to do was go and get Medusa's head. But before he did he would have to go to the Gray sisters.
First, he needed the help from Athena who would give him her strong shield and Hates invisible helmet. The gray sisters shared one eye so Perseus had o trick them into telling him where medusa was by threatening to drop the eye down a cliff. So they told him and we went on his way.
With the help of the Gods and Hates helmet, Persues was able to get Medusa's head before the other two sisters of hers could even see him escape.