The Unworthy Thor (2016-) #1

The Odinson's desperate search to regain his worthiness has taken him out into the cosmos, where he's learned of the existence of a mysterious other Mjolnir. This weapon of unimaginable power, a relic from a dead universe, is the key to Odinson's redemption — but some of the greatest villains of the Marvel Universe are now anxious to get their hands on it as well. Can The Odinson reclaim his honor, or will the power of thunder be wielded for evil? The quest for the hammer begins here.