| Issue | #18 |
| Published | June 1988 |
| Frequency | monthly |
| Cover Price | 1.75 USD; 2.20 CAD |
| Pages | 36 |
| Editing | Randy Stradley |
| Characters | Concrete; Masque [The Mask] (inset); Bob the Alien (inset) |
| Genre | science fiction |
| Pencils | Paul Chadwick |
| Inks | Paul Chadwick |
| Colors | Paul Chadwick |
| Characters | Concrete |
| Genre | science fiction |
| Script | Paul Chadwick |
| Pencils | Paul Chadwick |
| Inks | Paul Chadwick; Jed Hotchkiss (pages 1, 8) |
| Letters | Bill Spicer |
| Reprinted | in Concrete (Dark Horse, 2005 series) #6 (July 2006); 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 | Tim Harkins |
| Characters | Bob the Alien |
| Script | Rich Rice |
| Pencils | Rich Rice |
| Inks | Rich Rice |
| Letters | Rich Rice |