Look there! See that figure in the distance? Yes, those are three heads. We are nearing the gates of Hades, guarded by a fierce hound named Cerberus. Cerberus is a massive, fearsome beast. I am sure you have heard tales of him but seeing him in person can be intimidating. He is not just a huge dog with three heads but a mixture of the Underworld's most monstrous creatures. You can see now that he has the tail of a serpent and the heads of many snakes growing from his back. I assure you; Cerberus will not harm anyone unless they try to escape Hades. You see, Cerberus ensures that none but the souls of the dead enter the Underworld — unless accompanied by me! He also guards the gate so that no one can escape back into the world of the living.
Because Cerberus has allowed us safe passage through the gate, we are now in Hades. The Underworld is divided into three parts. First, there is paradise: The Elysian Fields. People earn the right to spend eternity in the Elysian Fields through heroic feats and virtuous deeds on earth.

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MPAA: PG
Go to source: https://www.commonlit.org/texts/welcome-to-the-underworld