The Black Riders are minor antagonists in the television series Once Upon a Time. A horde of dark horseriders, emerged from the darkness within the Once Upon a Time universe, the Black Riders occasionally serve dark and corrupted villains like Queen Regina. They briefly appear in the villains tournaments.
Disney Vs Non-Disney Villains War - Part Three
The Black Riders assist Queen Regina, in taking out Sauron's army of orcs. Although, not contributing their effort into the battle, the Black Riders look on as Regina successfully takes out one of Sauron's champions, the Witch-King of Angmar. They are not seen again.
Disney Villains War
The Black Riders appear in the Prologue of the war, as amongst the heralds of the Great Evil, spreaded by Chernabog, in the Multi-verse. They cause chaos in the Live-action realm, until Chernabog's defeat. They are not seen again afterwards.