| Issue | #20 |
| Published | August 1988 |
| Frequency | monthly |
| Cover Price | 2.95 USD; 3.70 CAD |
| Pages | 68 |
| Editing | Randy Stradley |
| Notes | This is a special sixty-four page giant annual issue published for the second year anniversary of Dark Horse Presents. |
| Characters | Concrete; Mr. Monster (inset); Black Cross (inset); Trekker (inset); Flaming Carrot (inset); Masque [The Mask]; Mindwalk (inset) |
| Genre | science fiction |
| Pencils | Paul Chadwick |
| Inks | Paul Chadwick |
| Colors | Chris Chalenor |
| Characters | Concrete |
| Genre | Science Fiction |
| Script | Paul Chadwick |
| Pencils | Paul Chadwick |
| Inks | Paul Chadwick |
| Notes | First and last page of issue is framing sequence of Concrete reading this issue. |
| Reprinted | in Concrete (Dark Horse, 2005 series) #6 (July 2006) |
| Characters | Mr. Monster |
| Genre | horror; humor |
| Script | Michael T Gilbert; Chuck Gamble; Chuck Wacome |
| Pencils | Michael T Gilbert; Chuck Gamble; Chuck Wacome |
| Inks | Michael T Gilbert; Chuck Gamble; Chuck Wacome |
| Letters | Ken Bruzenak |
| Script | Gary Davis |
| Pencils | Gary Davis |
| Inks | Gary Davis |
| Script | Rick Geary |
| Pencils | Rick Geary |
| Inks | Rick Geary |
| Characters | Trekker |
| Script | Ron Randall |
| Pencils | Ron Randall |
| Inks | Ron Randall |
| Letters | Ken Bruzenak |
| Characters | The Mystery Men; Flaming Carrot |
| Script | Bob Burden |
| Pencils | Bob Burden |
| Inks | Bob Burden |
| Letters | Roxanne Starr |
| Script | Douglas C. Potter |
| Pencils | Douglas C. Potter |
| Inks | Douglas C. Potter |
| Reprinted | in Best of Dark Horse Presents, The (Dark Horse, 1989 series) #1 |
| Characters | Masque [The Mask] |
| Script | Mark Badger |
| Pencils | Mark Badger |
| Inks | Mark Badger |
| Letters | David Jackson |
| Characters | Concrete |
| Genre | science fiction |
| Script | Paul Chadwick |
| Pencils | Paul Chadwick |
| Inks | Paul Chadwick |
| Letters | Bill Spicer |
| Reprinted | in Concrete (Dark Horse, 2005 series) #6 (July 2006) |
| Characters | Bob the Alien |
| Script | Rich Rice |
| Pencils | Rich Rice |
| Inks | Rich Rice |
| Letters | Rich Rice |
| Reprinted | in Best of Dark Horse Presents, The (Dark Horse, 1989 series) #1 |
| Script | Randy Stradley |
| Pencils | Randy Emberlin |
| Inks | Randy Emberlin |
| Letters | Willie Schubert |
| Characters | Wacky Squirrel |
| Genre | Funny Animal |
| Script | Jim Bradrick |
| Pencils | Jim Bradrick |
| Inks | Jim Bradrick |
| Reprinted | in Best of Dark Horse Presents, The (Dark Horse, 1989 series) #1 |
| Characters | Black Cross |
| Script | Chris Warner |
| Pencils | Chris Warner |
| Inks | Chris Warner |
| Reprinted | in Best of Dark Horse Presents, The (Dark Horse, 1989 series) #1 |
| Notes | Inside back cover with black and white reproductions of the covers to Dark Horse Presents #1-16. |
| Characters | Concrete |
| Pencils | Paul Chadwick |
| Inks | Paul Chadwick |
| Notes | One quarter page illustration of Concrete on back cover of issue. |