Quetzalcoatl was a Mesoamerican god and secret Ogdru Hem. it was known as Aztec mummy. The mummy turns into a bat, picks up Hellboy, and drops him in a church. Hellboy chases the bat into a graveyard where reanimated corpses attack him. After Hellboy punches the bat, it turns into a snake and it's head appears in the sky and then disappears.