| Issue | #21 |
| Published | February-March 1976 |
| Cover Price | 0.25 USD |
| Pages | 36 |
| Editing | Joe Orlando; Paul Levitz (Assistant Editor) |
| Characters | Swamp Think [Alec Holland]; Solus |
| Genre | horror |
| Pencils | Nestor Redondo |
| Inks | Nestor Redondo |
| Characters | Swamp Thing [Alec Holland]; Solus; Kolom; Jettak; Cellanth; Krell |
| Synopsis | Swamp Thing is transported to a spaceship controlled by an alien who has gone mad from isolation. |
| Genre | horror |
| Script | David Michelinie |
| Pencils | Nestor Redondo |
| Inks | Nestor Redondo |
| Colors | Tatjana Wood ? |
| Letters | Marcos |
| Letters | Typeset |
| Characters | Captain Marvel [Billy Batson] |
| Genre | Superhero |
| Pencils | Curt Swan (?) |
| Inks | Vince Colletta (?) |