Even though Odin forbade Thor from traveling to Jotunheim to exact revenge on the Frost Giants, the God of Thunder decided to do exactly that, thanks in part to the machinations of Loki, who had secretly let the first batch of Frost Giants in. Though Fandral remained concerned about the dangers, Thor convinced him by reminding him and Hogun that he had led them into some of their most glorious battles. Thor then did the same with Volstagg, but instead brought up the many delicacies they've enjoyed together. The Warriors Three, Loki and Sif all decided to follow Thor on his quest to make the Frost Giants pay.
Upon arriving in Jotunheim, the Asgardians came upon King Lauffey. The Frost Giant leader goaded Thor into a fight, even though he said that such an act would lead to war between the two realms. As the battle began, Hogun unleashed his mace and throwing knives, Volstagg wielded his battle axe and Fandral his trusty sword.
During the fracas, Volstagg was touched by one of the giants and realized that coming into contact with them would result in frost burns. Soon after, Fandral discovered an even more dangerous element, frozen spikes, which he became impaled upon. Wanting to get his comrade help, Volstagg hoisted Fandral on his back and headed towards the Bifrost, picking up the pace as Lauffey unleashed a giant monster on their trail. It nearly ate its prey, but Thor ended the threat. Cornered and waiting for the Bifrost, the Warriors Three and Sif found a surprise as Odin came through the gate and had words with Lauffey.
Upon returning to Asgard, Sif, Hogun and Volstagg took Fandral to the healers while Odin punished Thor by stripping him of his powers and sending him to Earth. Soon after, while recuperating, Loki revealed to them that he told a guard to let Odin know about their trip to Jotunheim. After Loki left, Volstagg said they should thank him for bringing about their salvation, but Hogun reminded them that Lauffey claimed Odin's house had traitors. And who could be more equipped to let Frost Giants into Asgard on the sly than a master of magic?