| Issue | #21 |
| Published | February 1984 |
| Cover Price | 0.75 USD |
| Pages | 36 |
| Editing | Len Wein |
| Characters | Swamp Thing |
| Genre | horror |
| Pencils | Tom Yeates (signed) |
| Inks | Tom Yeates (signed) |
| Colors | Tatjana Wood |
| Reprinted | in Essential Vertigo: Swamp Thing (DC, 1996 series) #1; in Millennium Edition: The Saga of the Swamp Thing No. 21 (DC, 2000 series) #[nn]; in Saga of the Swamp Thing (DC, 2009 series) #1 |
| Characters | Swamp Thing; Floronic Man [Jason Woodrue]; General Avery Carlton Sunderland; Alec Holland (in flashback); Linda Holland (as corpse) |
| Synopsis | General Sunderland hires Jason Woodrue to examine Swamp Thing and determine how Alec Holland became the monster, but Woodrue discovers that Swamp Thing only thinks that he was Alec Holland. When Sunderland fires Woodrue, the scientist allows Swamp Thing to take revenge on Sunderland for the both of them. |
| Genre | horror |
| Script | Alan Moore |
| Pencils | Stephen R. Bissette |
| Inks | John Totleben |
| Colors | Tatjana Wood |
| Letters | John Costanza |
| Reprinted | in Best of DC, The (DC, 1979 series) #61; in Saga of the Swamp Thing (DC, 1987 series) #[nn]; in Essential Vertigo: Swamp Thing (DC, 1996 series) #1; in Millennium Edition: The Saga of the Swamp Thing No. 21 (DC, 2000 series) #[nn]; in Inferno (Epix; Atlantic Förlags AB, 1991 series) #1/1991 |