| Issue | #13 |
| Published | August 1990 |
| Cover Price | $1.00 |
| Pages | 36 |
| Editing | Scott Fulop [Scott D. Fulop]; Victor Gorelick (Editor-In-Chief) |
| Notes | Raphael is colored all black in this issue. |
| Characters | Donatello; Michaelangelo; Raphael; Leonardo (All as the Teenage Mutant Ninja Turtles); Wingnut; Trap; Screwloose; Leatherhead [Jess Harley]; Maligna's Warrior Insectoid Children |
| Genre | Super-Hero; Children |
| Pencils | Ken Mitchroney ? |
| Inks | Ryan Brown ? |
| Notes | Raphael is colored all black in this issue. |
| Characters | Donatello; Michaelangelo; Raphael; Leonardo (All as the Teenage Mutant Ninja Turtles); Wingnut; Trap; Screwloose; Leatherhead [Jess Harley]; Maligna's Warrior Insectoid Children; Fayme; Cherubae; Krang (Villain); Sons Of Silence; The Shredder [Oroku Saki] (Villain); Bebop (Villain); Rocksteady (Villain); Maligna (Villain); Cudley The Cowlick; Stump; Sling |
| Synopsis | In Dimension-X, the turtles battle warrior insectoids plus The Shredder and his goons as they set out for the ancient and powerful Turnstone, a device capable of giving certain thoughts form. |
| Genre | Super-Hero; Children |
| Script | Dean Clarrain; Ryan Brown (Plot) |
| Pencils | Ken Mitchroney; Buz McKim (Clean-ups) |
| Inks | Dan Berger |
| Colors | Barry Grossman |
| Letters | Gary Fields |
| Characters | Donatello (Letter page heading) |
| Synopsis | Letters on fan reaction to issue #7; #9 & #10. |
| Genre | Super-Hero; Children |
| Notes | Letters wrote by M. Anthony Mataban; Jeff Townsend; Jacob Perlman; Elizabeth McElroy & Sean Berry. |
| Characters | Leonardo |
| Synopsis | Teenage Mutant Ninja Turtles skateboard elbow and kneepad order form ad. |
| Genre | Super-Hero; Children |
| Notes | Pads cost $11.95 each plus $3.00 shipping. |