Chernabog (Once Upon a Time)

Chernabog is a minor villain in Once Upon a Time. Specifically, he appears in the episode "Darkness on the Edge of Town".

Overview
After Regina releases the fairies from the Sorcerer's Hat, Chernabog emerges and proceeds to wreak havoc across Storybrooke. Regina and Emma attempt to stop the demon, but even with their combined magic, they only manage to stun the creature. As it turns out, Maleficent, Cruella and Ursula had faced Chernabog in the past, so Regina and Emma request their help in defeating it. Regina and Emma manage to lure Chernabog to the town line where Chernabog winds up crossing the line. Since whoever leaves Storybrooke cannot re-enter, Chernabog disappears.