Some TMNT stuff really isn't for little kids.

The terrapin/human exo-armor synthesis was a secret project at StockGen, commissioned by General Krang. The intention was to give his humanoid soldiers unbreakable stone-like skin, which was based on the natural carapaces of turtles. The Ninja Turtles themselves were lab specimens for this experiment prior to their mutations, presumably for genetic material.

The project was ultimately a success, creating hard-skinned soldiers such as Tragg and Granitor.

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