| Issue | #1 |
| Published | October 1968 |
| Cover Price | 0.25 USD |
| Pages | 68 |
| Editing | Roy Thomas |
| Characters | Thor; Odin; Loki; Balder; Heimdall; Hela; Ulfrin the Dragon; Ymir; Geirrodur |
| Genre | Superhero; Fantasy |
| Pencils | Jack Kirby |
| Inks | Jack Kirby |
| Characters | Thor; Odin; Skoll the Wolf God |
| Genre | Superhero; Fantasy |
| Pencils | Jack Kirby |
| Inks | Chic Stone; Don Heck; George Roussos [as George Bell] |
| Notes | Inside front cover, includes a spot illustration from an unknown story, two from Odin Battles Ymir, King of the Ice Giants and one from "The Invasion of Asgard!". |
| Characters | Odin; Surtur (Introduction); Ymir (Introduction, Origin); Buri (Introduction, Origin); Borr (Introduction) |
| Synopsis | Story about how Odin and his brothers protected the Earth while waiting for the coming of man. |
| Genre | Superhero; Fantasy |
| Script | Stan Lee |
| Pencils | Jack Kirby |
| Inks | George Roussos [as George Bell] |
| Colors | Stan Goldberg |
| Letters | Artie Simek |
| Editing | Stan Lee (Original Editor) |
| Notes | Origin and first appearance of Ymir and Buri, first appearance of Surtur and Borr. |
| Reprinted | from Journey into Mystery (Marvel, 1952 series) #97 (October 1963) |
| Characters | Odin; Ymir |
| Synopsis | Story of Odin defeating Ymir. |
| Genre | Superhero; Fantasy |
| Script | Stan Lee |
| Pencils | Jack Kirby |
| Inks | Don Heck |
| Colors | Stan Goldberg |
| Letters | Artie Simek |
| Editing | Stan Lee (Original Editor) |
| Reprinted | from Journey Into Mystery (Marvel, 1952 series) #98 (November 1963) |
| Characters | Odin; Surtur |
| Synopsis | Story of how Odin trapped Surtur in the center of the Earth. |
| Genre | Superhero; Fantasy |
| Script | Stan Lee |
| Pencils | Jack Kirby |
| Inks | Jack Kirby |
| Colors | Stan Goldberg |
| Letters | Artie Simek |
| Editing | Stan Lee (Original Editor) |
| Reprinted | from Journey Into Mystery (Marvel, 1952 series) #99 (December 1963) |
| Characters | Thor; Loki; Odin; Agnar, King of the Eagles (Introduction) |
| Synopsis | Thor and Loki (as children) defeat three Storm Giants and return the Golden Apples of Iduna. |
| Genre | Superhero; Fantasy |
| Script | Stan Lee |
| Pencils | Jack Kirby |
| Inks | Paul Reinman |
| Colors | Stan Goldberg |
| Letters | Artie Simek |
| Editing | Stan Lee (Original Editor) |
| Notes | First in the Boyhood of Thor series. |
| Reprinted | from Journey Into Mystery (Marvel, 1952 series) #100 (January 1964) |
| Characters | Thor; Loki; Heimdall; Norn Hag; Ulfrin the Dragon (Introduction); Skoll (Introduction); Hati (Introduction); Rime Giants (Introduction); Geirrodur (Introduction); Odin |
| Synopsis | Thor holds off the enemies of Asgard until help arrives. |
| Genre | Superhero |
| Script | Stan Lee |
| Pencils | Jack Kirby |
| Inks | George Roussos [as George Bell] |
| Colors | Stan Goldberg |
| Letters | Artie Simek |
| Editing | Stan Lee (Original Editor) |
| Notes | The second Boyhood of Thor story, first appearances of Skoll and Hati the Wolf Gods, Ulfrin the Dragon, Rime Giants and Geirrodur the Troll. |
| Reprinted | from Journey Into Mystery (Marvel, 1952 series) #101 (February 1964) |
| Characters | Thor; Hela, Goddess of Death (Introduction); The Three Norn Fates (Introduction); Balder; Sif (Introduction); King Rugga (Introduction) |
| Synopsis | Thor (at the age of 18) rescues Sif from Hela, goddess of Death, and earns the right to carry the Hammer of Odin. |
| Genre | Superhero; Fantasy |
| Script | Stan Lee |
| Pencils | Jack Kirby |
| Inks | Paul Reinman |
| Colors | Stan Goldberg |
| Letters | Artie Simek |
| Editing | Stan Lee (Original Editor) |
| Notes | Third in the Boyhood of Thor series, first appearances of Hela, Goddess of Death, The Three Norn Fates, King Rugga and Sif. |
| Reprinted | from Journey Into Mystery (Marvel, 1952 series) #102 (March 1964) |
| Characters | Spider-Man; Thor |
| Script | ? (promo copy) |
| Notes | Advertisement for Spider-Man and Thor plastic pillows for $1.50 each. |
| Characters | Captain Marvel; Spider-Man; Thor; Hulk |
| Script | ? (promo copy) |
| Notes | Advertisement for Marvel Super-Hero T-Shirts ($2.00 each) and the Merry Marvel Marching Society Membership Kit ($1.00 each). |
| Characters | Thor; Sindri, King of the Dwarfs (Introduction); Skord (Introduction); Gullin, the Boar God (Introduction); King Mirmir (Introduction); Aske (first male human) (Introduction); Embla (first female human) (Introduction); Skipbladner (ship) (Introduction) |
| Synopsis | Story of how Odin created the first humans. |
| Genre | Superhero; Fantasy |
| Script | Stan Lee |
| Pencils | Jack Kirby |
| Inks | Chic Stone |
| Colors | Stan Goldberg |
| Letters | Artie Simek |
| Editing | Stan Lee (Original Editor) |
| Notes | Fourth in the Boyhood of Thor series, next story in this series is in Thor #252. |
| Reprinted | from Journey into Mystery (Marvel, 1952 series) #103 (April 1964) |
| Characters | Heimdall; Odin; Agnar the Fierce (I); Gotron, the Agile (I); King of the Storm Giants (name Brimer is revealed in the next issue) (I) |
| Synopsis | Story of how Heimdall earned the right to guard the Rainbow Bridge. |
| Genre | Superhero; Fantasy |
| Script | Stan Lee |
| Pencils | Jack Kirby |
| Inks | Don Heck |
| Colors | Stan Goldberg |
| Letters | Artie Simek |
| Editing | Stan Lee (Original Editor) |
| Notes | First in the Heimdall Biography series, first appearances of Agnar the Fierce, Gotron, the Agile and the King of the Storm Giants (Brimer). |
| Reprinted | from Journey Into Mystery (Marvel, 1952 series) #104 (May 1964) |
| Characters | Heimdall; King Brimer; Queen Nedra (I); Odin; a Vanna (an air-sprite) (I) |
| Synopsis | Story of how an Air Spirit snuck past Heimdall. |
| Genre | Superhero; Fantasy |
| Script | Stan Lee |
| Pencils | Jack Kirby |
| Inks | George Roussos [as George Bell] |
| Colors | Stan Goldberg |
| Letters | Artie Simek |
| Editing | Stan Lee (Original Editor) |
| Notes | Second in the Heimdall Biography series, first appearances of Queen Nedra and a Vanna (an air-sprite). |
| Reprinted | from Journey Into Mystery (Marvel, 1952 series) #105 (June 1964) |
| Characters | Balder; Odin; Thor; Tyr (I); Honir (I) |
| Synopsis | Story of how Balder gained his invincibility. |
| Genre | Superhero; Fantasy |
| Script | Stan Lee |
| Pencils | Jack Kirby |
| Inks | Vince Colletta |
| Colors | Stan Goldberg |
| Letters | Artie Simek |
| Editing | Stan Lee (Original Editor) |
| Notes | First in the Balder Biography series, first appearances of Tyr and Honir. |
| Reprinted | from Journey Into Mystery (Marvel, 1952 series) #106 (July 1964) |
| Characters | Sgt. Fury; Dum Dum Dugan; Phantom Eagle |
| Pencils | Dick Ayers; Herb Trimpe |
| Inks | John Severin; Herb Trimpe |
| Notes | Promos for Sgt. Fury Annual #4 and Marvel Super-Heroes #16 using a reprint of their front covers. |