Published Sep 1968 by Marvel.
Thor faces Mangog and Loki in "The Hammer and the Holocaust!" Script by Stan Lee, pencils by Jack Kirby, inks by Vince Colletta. Appearances by Balder, Sif, Karnilla, Hogun, Fandral, Volstagg, Heimdall, the Recorder, and Odin. Kirby/Colletta cover. Cover price $0.12.