Quetzalcoatl is a powerful deity of Mesoamerican mythology. Little is known about the nature of its connection to Route 50.
In 2010, when attempting to create an alphabet book of Route 50, Pope tried to shoehorn Quetzacoatl into the Route's mythos so he would have an entry for Q. However, the alphabet book project was abandoned soon after.
Quetzalcoatl later appeared in the Saga as a mysterious monster attacking Route 50, prompting Clouded-Immortal to demonstrate her newly acquired magical girl powers.