THOR (1962) #138

One who is Unworthy steals the hammer of Thor! But will they be able to wield Mjolnir? Plus, behold the mystic might of the Orb of Orikal! While Thor is trapped on Earth, the trolls have escaped with his hammer, and in Asgard their invasion is virtually assured with no interference from the thunder god, and the power of alien weaponry at their disposal. The backup feature continues the quest of Hogun, Thor and their companions to find and seek vengeance against Mogul.