THOR (1962) #137

Ulik’s first appearance! When Lady Sif is captured by Geirrodur, King of the Trolls, Thor is lured into battle. But Thor isn’t expecting as worthy a combatant as Ulik, the Rock Trolls’ most powerful warrior! Thor battles the troll Ulik in the main story, and in the backup feature, he’s joined by the Warriors Three against Mogul.