The Mighty Thor #137 (February 1967) by Marvel Comics
Cover pencils by Jack Kirby, inks by Vince Colletta. First appearance of Ulik of the Rock Trolls in "The Thunder God and the Troll!"; Geirrodur's trolls capture Sif and lure Thor after her; Thor must battle Ulik, mightiest of the Rock Trolls. Tale of Asgard: "The Tragedy of Hogun!", script by Stan Lee, pencils by Jack Kirby, inks by Vince Colletta; Thor and his companions find the dying Saguta who is a countryman of Hogun's; Hogun swears vengeance on Mogul, lord of the Mystic Mountain, who did this.