Thor Vol 1 138 - Marvel Database

thor 138Geirrodur consults the imprisoned Orikal to learn about his invasion force. Orikal believes Asgard will soon lose. Thor releases Mjolnir to free Sif from a mystical sphere. The troll stealsThor has returned to Earth in order to rescue Sif from the clutches of Ulik. In order to search for his foe unnoticed, Thor taps his hammer and changes back