Cerberus

Cerberus is the child of Typhon and Echidna. He guards the gates to the underworld. He makes sure nobody leaves the underworld. He belongs to Hades. Orpheus tricked Cerberus while Orpheus was trying to get into the underworld. Orpheus used a magic charm to get past him. Once Hercules dragged Cerberus from the underworld to the mainland.