The story of Chinese legendary anti-hero Zhong Kui, a young man endowed with mysterious powers who is forced into a battle among the realms of Heaven, Earth and Hell in the course of his attempt to save his countrymen and the woman he loves.

Immediately after the events of The Desolation of Smaug, Bilbo and the dwarves try to defend Erebor's mountain of treasure from others who claim it: the men of the ruined Laketown and the elves of Mirkwood. Meanwhile an army of Orcs led by Azog the Defiler is marching on Erebor, fueled by the rise of the dark lord Sauron. Dwarves, elves and men must unite, and the hope for Middle-Earth falls into Bilbo's hands.

The third season revolves around the main characters travelling from Storybrooke to Neverland to retrieve Henry Mills, featuring crossover episodes connecting with the spin-off Once Upon a Time in Wonderland.