Long before he was worthy to wield the war hammer, Mjolnir, Thor, son of Odin, was an impetuous young prince of Asgard hungry to prove himself a worth warrior. To that end, he and his half-brother, Loki, stow away with the the Warriors Three to find the Sword of Surtur in Yodenheim. However, that quest would prove more challenging than the prince anticipated as grave perils and agonizing moral choices arise.