An angry King goes to an Oracle to ask about a son and the Oracle only told him that he would have a Grandson who would kill him.
The King trapped his daughter in a castle and then golden rain came down and they had a child and her dad finds out and she puts the baby boy in a box and puts him in the sea.
Perseus is found by a fisherman and grows up there. After a few years, Perseus' dad invites him to a party where he asks if Perseus could bring him Medusa's head since he was sure it would kill Perseus.
Perseus then traveled to Athena, Hermes, and nymphs to obtain winged sandals, a helmet that made him invisible, a sword, and a mirrored shield.
Perseus then flies over to where Medusa and her 2 sisters are sleeping and cuts off Medusa's head and escapes since the sisters couldn't see him.
Perseus then went back to his dad with the head on his shield