Emanuel is a chicken. He'd rather play with his marbles than stand up to bullies. Even the monsters in his abuelita's folk stories scare him. So imagine his surprise when one of those monsters, El Raton, appears in his bedroom one night to steal his marbles and drag him through a portal to Astlan, home to the Aztecs.

Thankfully, Emanuel is rescued by a shape-shifter named Chiko, who introduces him to this magical land where fabled spirits and monsters of his childhood run amok. It's not long before Emanuel discovers the Sun Stone and must become the Sun Warrior, protector of Astlan. Only he can put an end to El Raton's reign and free the people of Astlan from his terror.