Some TMNT stuff really isn't for little kids.
Of Turtles and Stones and Mary Bones is issue 6 of the TMNT Adventures, and was published in November 1989.
- Plot: Ryan Brown & Dean Clarrain
- Writing: Dean Clarrain
- Pencils: Ken Mitchroney
- Inks: Dave Garcia
- Letters: Gary Fields
- Colors: Barry Grossman
- Edits: Victor Gorelick
- Ace Duck (cameo) (debut)
- Mary Bones (debut)
- Jess Harley / Leatherhead (debut)
- Oroku Saki / The Shredder
Jess Harley in the Deep American South bayou steals what he doesn't know is the Turnstone from Mary Bones, according to rumors a swamp witch. He travels by bus to New York City in an attempt to sell it. Mary Bones tracks him into town, and takes back the Turnstone and uses it to transform Jess Harley into Leatherhead.
The Shredder tricks Leatherhead into believing the turtles work with Mary Bones. Shredder, Bebop, Rocksteady and Leatherhead encounter the turtles at an underground bridge beneath New York City, and Bebop and Rocksteady throw the turtles' motorized skateboards off the bridge.
Shredder eventually reveals that he never intended to honor his end of the deal with Leatherhead, and the turtles fight Shredder, Bebop and Rocksteady. Leatherhead, in anger over Shredder lying, begins to stomp on the underground bridge, despite the Turtles' warning. The bridge collapses, and Leatherhead seemingly plummets to his demise...
Shredder, Bebop and Rocksteady, now being on the opposite side of the hole, run away. Suddenly a light appears, and Mary Bones shows up, telling the turtles to not mourn Leatherhead, because they will triumph in the final conflict.
- On the cover, Leatherhead is shown wearing a hat that would become part of this version's signature look. But in the pages of the issue itself, neither his human nor mutant form is ever shown wearing this hat.
- Jess Harley's human appearance is patterned after Lance Henriksen.