Rothgar is a miner on an asteroid within the Dark Nebula. He and his accomplices are being besieged by a force of alien Gramosians whom want access to a jewel within the asteroid. The miners mistake the arriving Asgardians as attacking Gramosians and fly out to stop them. After discovering the diplomatic nature of the Asgardians, they agree to help them search for the missing Sif and Karnilla. However, Mercurio and his forces attack the Asgardians before they can begin searching. The three miners stay out of the conflict and flee within the asteroid, stating that they must save the jewel and surrender their wills to it.

He and the other miners are possessed by Xorr and forced to battle Thor and his band. The lead miners pilot a spaceship that has captured the God-Jewel away from their enemies, but they continue to follow them. Kagg employs weapons against their ship, but Thor destroys them all with Mjolnir, and they catch up to the miners. Rothgar maintains a defence against the heroes.