Perseus is guided to Medusa's cave with the help of Hermes. With much luck Perseus finds Medusa and her sisters asleep, making an easy kill. The sisters were awoken by the killing and chase after Perseus.
The Road Back
On his return home Perseus sees the Princess of a Kingdom being attacked by a Sea Monster. He fights off the Monster and kills him, saving the Princess Andromeda.
Before Perseus kills the monster he asks Andromeda if she will marry him if he saves her. She agrees and they get married.
Restoring the World
Polydectes was looking to kidnap or kill Danaë and Dictus, and cornered them in Athena's temple. Perseus came just in time to kill Polydectes and return his equipment and Medusa's head to the gods.
Perseus, after killing the bad king Polydectes, was crowned king of Seriphos but declined and gave it to Dictys as he was experienced.
Perseus learned leadership skills, courage and confidence. And he returned to his simple life living with Andromeda