| Issue | #66 |
| Published | 18 May 1968 |
| Cover Price | 9d [0-0-9 UKP] |
| Pages | 40 |
| Editing | Alf Wallace [as Alf]; ? [as Bart]; Stan Lee (original editor) |
| Genre | Superhero |
| Pencils | Don Heck |
| Inks | Don Heck |
| Letters | Typeset |
| Reprinted | from Avengers, The (Marvel, 1963 series) #33 (October 1966) |
| Characters | The Supreme Serpent; Sons of the Serpent |
| Genre | Superhero |
| Script | Stan Lee |
| Pencils | Don Heck |
| Inks | Don Heck |
| Letters | Artie Simek |
| Reprinted | from Avengers, The (Marvel, 1963 series) #33 (October 1966) |
| Characters | Jane Foster; Odin; Pluto; Seidring |
| Genre | Superhero |
| Script | Stan Lee |
| Pencils | Jack Kirby |
| Inks | Vince Colletta |
| Letters | Sam Rosen |
| Reprinted | from Thor (Marvel, 1966 series) #127 (April 1966) |
| Characters | Tyrannus; Mole Man |
| Genre | Superhero |
| Script | Roy Thomas |
| Pencils | Dan Adkins |
| Inks | Dan Adkins |
| Letters | Jerry Feldman |
| Notes | Final part of story. |
| Reprinted | from X-Men (Marvel, 1963 series) #34 (July 1967) |
| Characters | The Living Tribunal |
| Genre | Superhero; Occult |
| Script | Roy Thomas; Marie Severin |
| Pencils | Marie Severin |
| Inks | Herb Trimpe |
| Letters | Artie Simek |
| Notes | Final part of story. |
| Reprinted | from Strange Tales (Marvel, 1951 series) #158 (July 1967) |
| Letters | Typeset |
| Notes | A full page color advertisement replaces the Power House Pin-Up this issue. |