| Issue | #21 |
| Published | June 1969 |
| Cover Price | 0.25 |
| Editing | Roy Thomas |
| Notes | Cover based on the cover of Fantastic Four (Marvel, 1961 series) #29. |
| Genre | superhero |
| Pencils | Jack Kirby |
| Inks | Chic Stone |
| Notes | Cover based on the cover of Fantastic Four (Marvel, 1961 series) #29. |
| Genre | superhero |
| Script | Stan Lee |
| Pencils | Jack Kirby |
| Inks | Chic Stone |
| Letters | Sam Rosen |
| Reprinted | from Fantastic Four (Marvel, 1961 series) #29 (August 1964) |
| Genre | superhero |
| Script | Stan Lee |
| Pencils | Don Heck |
| Inks | Dick Ayers |
| Letters | Sam Rosen |
| Reprinted | from Tales of Suspense (Marvel, 1959 series) #62 (February 1965) |
| Characters | Watcher [Uatu]; Queen Kalthea; Fantastic Four [Thing; Human Torch; Mister Fantastic] (cameo) |
| Synopsis | The Watcher falls in love with a courageous alien queen, but his duty forces him to leave her. |
| Genre | science fiction |
| Script | Stan Lee (plot); Larry Lieber |
| Pencils | Larry Lieber |
| Inks | George Roussos |
| Letters | Artie Simek |
| Reprinted | from Tales of Suspense (Marvel, 1959 series) #56 (August 1964) |
| Script | Stan Lee |
| Pencils | Steve Ditko |
| Inks | Steve Ditko |
| Letters | Artie Simek |
| Reprinted | from Strange Tales (Marvel, 1951 series) #130 (March 1965) |