After the destruction of the last Norn Stone, Surtur was released from his imprisonment then burned Nidavelirr to the stone, killing almost all the dwarves and nearly destroying a supply of precious uru.
After Thor learns of Surtur's release and of the disappearance of the Twilight Sword, he alerts Odin. Odin goes on his own to investigate the release of Surtur only to return with very little knowledge. When a ship is discovered in Midgard with the presence of Surtur, Thor, with the help of Heimdall, travels to the ship to learn of Surtur's plans. There Thor finds Beta Ray Bill, a survivor of Surtur's destruction of the Korbinite home planet.
During a battle with Amora, Thor and Beta Ray Bill discovered Amora speaks with the voice of Surtur.