Perseus needed a gift fro Polydectes wedding, so Perseus went to go and kill Medusa and give it to Polydectes as his wedding gift.
Reward and Journey home
hermes gave Perseus a sword and a plan, while Athena gave Perseus a shield and a way to prevent being turned to stone.
Restoring the world
Perseus's tests were to figure out where Madusa was and kill her. To do this he talked to many people but eventually got to three women and they told him where Madusa lived. Then he had to kill Madusa. The supreme ordeal was to eventually kill the bad king and free the town.
Perseus crowns Dictys kind of the land and then returns to Greece with Adromeda.
Perseus threw a disc and it hit Acrisius and killed him. Then Perseus and Andromeda lived happily ever after.