Perseus and Andromeda
So Perseus took the winged sandals and the sword and the shield and he said thank you and he flew to where Medusa's cave was. She lived there with her two sisters who were ugly too like her. When Perseus got there all three sisters were asleep. Perseus remembered not to look at them and he looked in the shiny shield and cut off their heads - all three of them! Then Perseus took Medusa's head and put it in a bag and flew away.
(In some versions of the story, the winged horse Pegasus flew out of Medusa's neck when Perseus cut off her head.)
Here's a claymation video of Perseus and Medusa
As Perseus was flying home he heard somebody screaming and crying so he flew down lower to see. It was a woman who was tied to a big rock on the edge of the ocean! Perseus saw that she was screaming because a huge sea monster snaky thing was about to eat her up. So he flew down to the rock and just as the monster was about to get them he pulled Medusa's head out of the bag and showed it to the monster and the monster turned into stone, just like that!
Perseus holds up Medusa's head
(Stabiae, ca. 50 AD) Photo by Wikimedia Commons user Luiclemens
So Perseus untied the woman. She said her name was Andromeda, and her father, who was king there, had tied her up there so the monster would take her and leave the rest of the family alone. So Perseus took Andromeda with him back to his home.
When Perseus finally did get home, he found that the bad king was still trying to get Danae to marry him. Perseus was angry about that, so he went right into the palace. The bad king asked Perseus why he had come back? And Perseus said because he had killed Medusa. The king laughed and said he didn't believe it, so Perseus showed him Medusa's head - and the king turned to stone too! So Perseus became the king, and he married Andromeda, and they all lived happily ever after.
Learn by doing: compare the Gorgons to Humbaba, or Kali
Another snake story: Hercules and the Hydra
Snake Hair: The Story of Medusa (All Aboard Books Reading Level 2)
by Stephanie Spinner and Susan Swan. A beginning reader book, just a few sentences on each page, and big pictures done with paper collage. My daughter and I loved this one.
Perseus, by Warwick Hutton (1993). A picture book for kids.
Say Cheese, Medusa! Myth-O-Mania, by Kate McMullan (2002). A "cool" retelling of the story, with a lot of puns. More sympathetic to Medusa than to Perseus.
D'aulaire's Book of Greek Myths, by Edgar and Ingri D'Aulaire.
Medusa: Solving the Mystery of the Gorgon, by Stephen R. Wilk (1999). For adults. Traces the story of Medusa using the ancient sources (writing and art) and then through the centuries to modern times.