Perseus tells the King about his plan to kill on of the the Gorgons. The king smile at him, because his own plan is being fulfilled, by this suicidal mission.
The Return Home
Athena and Hermes appear in front of Perseus in order to help him in his goal to kill Medusa.
Peace in the Kingdom
After an entire journey of tests, Perseus reaches the Gorgon Sisters, and deals with his Supreme Ordeal of killing Medusa.
Perseus, once he beheads Medusa, returns to the kingdom showing the king her head. This turns the king and his followers into stone, and he, with his mother and newly rescued maiden, return to his Grandfather's kingdom to rule.
When Perseus returns to his grandfather's castle, he finds out he is banished, and being the rightful ruler of the kingdom, he brings peace with his newfound queen. Later on in a disk throwing competition, his disc hits the audience, killing his evil father, Polydectis, who was watching the game.