| Issue | #66 |
| Published | May-June 1964 |
| Cover Price | 0.12 USD |
| Pages | 36 |
| Editing | Jack Schiff |
| Characters | Eclipso; Mona Bennett; Professor Bennett |
| Genre | superhero |
| Pencils | Dick Dillin |
| Inks | Sheldon Moldoff |
| Reprinted | In Showcase Presents: Eclipso (DC, 2009 series) #[nn] |
| Characters | Mark Merlin |
| Genre | occult |
| Script | Arnold Drake |
| Pencils | Mort Meskin |
| Inks | Mort Meskin |
| Notes | writer verified by Martin O'Hearn |
| Synopsis | You shouldn't make fun of people. |
| Script | Jack Schiff |
| Pencils | Sheldon Moldoff |
| Inks | Morris Waldinger ? |
| Letters | Ira Schnapp |
| Genre | Fact |
| Letters | typeset |
| Characters | Eclipso; Bruce Gordon; Mona Bennet; Professor Bennet |
| Synopsis | Bruce Gordon develops an ultra-violet ray gun to try to make Eclipso into a force for good. A meteor crashes to the ground and a space-creature is released that gives Eclipso new powers. |
| Genre | superhero |
| Script | Bob Haney |
| Pencils | Alex Toth |
| Inks | Alex Toth |
| Letters | Alex Toth |
| Reprinted | in Detective Comics (DC, 1937 series) #441 (June-July 1974); in Showcase Presents: Eclipso (DC, 2009 series) #[nn] |