Thor #214 (1962)

Cover pencils by Rich Buckler, inks by Frank Giacoia and Mike Esposito. "Into the Dark Nebula!", script by Gerry Conway, pencils by Sal Buscema, inks by Jim Mooney; The Asgardians travel to the Dark Nebula, there they are attacked by the miners, who think that they are raiders coming to attack again; Once they are defeated and realize who they are, they offer to help; They begin to check with the Alterian miners who deal in slaves, when they are attacked by Mercurio and his army; While they are fighting, the three miners surrender themselves to a gigantic jewel in their mine; The jewel then erupts from the surface and Thor sees that Sif and Karnilla are trapped within the jewel; The voice of the jewel tells them that if they come any closer, they will die. Appearances by Sif, Hogun, Fandral, Hildegarde, Heimdall, and Odin.