Marvel Comics © July 1968, Thor #154.  The story "...To Wake the Mangog!".  While Sif recovers, Hela shows Thor the glory of eternal battle he can enter if he surrenders to her. Loki takes the throne of Asgard while Odin undergoes the Odinsleep. Ulik frees Mangog from captivity.

Characters: Balder; Harokin; Hela; Karnilla; Loki; Mangog (introduction); Odin; Sif; Thor [Don Blake]; Ulik; Toag, Elder of the Council Supreme (introduction); Muggers, Inc. (introduction); The Legion of the Lost (introduction)

Script: Stan Lee    Pencils: Jack Kirby    Inks: Vince Colletta

This book grades 4.0 CGC #4177632005  Thanks for looking.     5370-1012-40/45cgc