"Unfit to lift his hammer, and with someone else now wielding the power of Thor, the Odinson's desperate quest to regain his worthiness takes him out into the cosmos - where he's learned of the existence of a mysterious other Mjolnir! This ultimate weapon, a relic from a dead universe, is the key to his redemption - but some of the greatest villains of the Marvel Universe are anxious to get their hands on it, including The Collector and Thanos!"--Back cover.