Thor (1966 series) #137

Rock Trolls ambush Thor and Sif, trying to take his hammer. Thor fights off the trolls, but they kidnap Sif.

Ulik faces Thor in the Troll kingdom. The trolls present Sif to their king, Geirrodur. Geirrodur plans to attack Thor while he’s Don Blake. He knocks Sif out and sends her to Earth via the Tunnel of Wind Currents.

Geirrodur teleports Ulik away during his fight with Thor. Geirrodur informs Thor that Ulik has captured Sif on Earth. Thor must choose between defending Asgard and saving Sif. Thor picks Sif and goes to Earth. Geirrodur invades Asgard through the open shaft.

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Story #2

The Tragedy of Hogun! (Tales of Asgard series)

Writer: Stan Lee.
Penciler: Jack Kirby.
Inker: Vince Colletta.
Letterer: Sam Rosen.

Synopsis

On their way back to Asgard, Thor and the Warriors Three come upon a man staked out in the desert to die. Hogun recognizes him as his countryman Saguta and they cut him down. The dying man tells Hogun he was left to perish by Mogul, the conqueror of their people, to serve as a warning to other rebels. Hogun demands to know where to find Mogul but Saguta dies without another word. Berserk, Hogun calls out to his enemy to come and face him—and the evil sorcerer Mogul appears in a cloud of smoke. Thor approaches the villain as Hogun demands the right of first combat. The wizard transforms his sword into a deadly serpent to hold the Thunder God back, Mogul then summons his mighty Jinn Devil to carry him to safety, shouting a challenge to the heroes to follow him to the Mystic Mountain, Hogun vows to destroy the enemy of his people, while Thor, Fandral, and Volstagg promise to aid him in his quest.