| Issue | #21 |
| Published | September 1961 |
| Frequency | monthly |
| Cover Price | 0.10 USD |
| Pages | 36 |
| Editing | Stan Lee |
| Notes | Distributed to newstands in June 1961. This issue includes 10 pages of paid advertisements. Distribution date from Joseph Marek's Marvel Comics Group history website. |
| Characters | Klagg |
| Genre | monsters |
| Pencils | Jack Kirby |
| Inks | Dick Ayers |
| Reprinted | in Marvel Masterworks: Atlas Era Tales of Suspense (Marvel, 2006 series) #3 (2010) |
| Characters | Klagg; Philip; Claire |
| Synopsis | Klagg, an alien who visits Earth, becomes so upset upon learning humanity still wages war that he declares war upon the nations of the Earth. The hero of the story convinces communist agents to pool their forces with the democracies in an effort to present a united front against Klagg. The effort is successful because the fact the various nations were able to set aside their differences and band together convinces Klagg to give up his campaign of destruction and leave Earth. |
| Genre | monsters |
| Pencils | Jack Kirby |
| Inks | Dick Ayers |
| Notes | This story is divided into two parts: an untitled part one (6 pp) and part two—"Klagg" (7 pp). |
| Reprinted | in Where Monsters Dwell (Marvel, 1970 series) #20 (March 1973); in Marvel Masterworks: Atlas Era Tales of Suspense (Marvel, 2006 series) #3 (2010) |
| Characters | Oston Trams; Mrs. Trams; Laer Trams; Mike Ross |
| Synopsis | An extraordiinary child excels at sports and school, but does it all backwards. |
| Genre | humor |
| Pencils | John Tartaglione |
| Inks | John Tartaglione |
| Letters | typeset |
| Notes | Text story with illustration. |
| Reprinted | from Strange Tales (Marvel, 1951 series) #58 (May 1957) |
| Characters | Joe Kane |
| Synopsis | A man wakes up in the morning and sees a stranger's face in the mirror and then it shatters. He tries looking into another mirror and the same thing happens. He looks into a full length mirror and it happens a third time. He makes his way to work, avoiding mirrors, until he stands before the elevator. When the door opens, the man whose face he has seen is standing inside producing a terror-stricken reaction. Our hero runs away, and the puzzled man leaves the elevator which cable snaps, sending it plunging down the shaft to destruction. |
| Genre | occult |
| Pencils | Steve Ditko |
| Inks | Steve Ditko |
| Reprinted | in Marvel Masterworks: Atlas Era Tales of Suspense (Marvel, 2006 series) #3 (2010) |
| Characters | Walter Phelps |
| Synopsis | A man invents a time machine to travel back to the Roman Empire of 25 A.D. and set himself up as king, but all the present day devices he has brought back with him to prove his claims do not work without electricity, fuel, and broadcasting stations. |
| Genre | science fiction |
| Pencils | Jack Kirby |
| Inks | Dick Ayers |
| Notes | Narrated in the first person. This story is a retelling of "Trapped in Yesterday!" drawn by Carl Burgos in Tales of Suspense #2 (March 1959). |
| Reprinted | in Marvel Masterworks: Atlas Era Tales of Suspense (Marvel, 2006 series) #3 (2010) |