| Issue | #18 |
| Published | August 1986 |
| Cover Price | 0.75 |
| Pages | 36 |
| Editing | Archie Goodwin; Jo Duffy (associate) |
| Genre | barbarian; humor |
| Pencils | Sergio Aragones |
| Inks | Sergio Aragones |
| Colors | Tom Luth |
| Reprinted | in Groo Expose, The (Marvel, 1993 series) #[nn] |
| Characters | Grooella (intro) |
| Synopsis | Groo's sister, who is a ruling queen, calls for Groo when her city is under threat of attack |
| Genre | barbarian; humor |
| Script | Sergio Aragones (co-plot); Mark Evanier (co-plot & dialogue) |
| Pencils | Sergio Aragones |
| Inks | Sergio Aragones |
| Colors | Tom Luth |
| Letters | Stan Sakai |
| Notes | Division of writing credit from Mark Evanier via the GCD Errors list, September 2009. Continued in #19 and #20. |
| Reprinted | in Groo Expose, The (Marvel, 1993 series) #[nn] |