It appears, though, that the Shadow Ninja concept morphed a bit in the design process. Instead of the color changing plastic that was released at retail, Hasbro originally considered clear figures for the series. A few samples of these clear version made it out into the world and you can see examples of Snake Eyes, Stormshadow and Night Creeper below.
While the idea of clear figures would have been novel at the time, the design would have run its course quickly. Maybe if one of the figures in the set had been "invisible", it would have been a cool gimmick. But, a whole series of them quickly showed the fad's limitations. You can see the inner workings of the figures. And, since these molds all had spring loaded features, there's a lot of guts to see.
There's no real info as to why this concept was abandoned for the color changing plastic. We can speculate that the color changing gimmick was better received than the clear plastic. But, we don't know for sure. These figures are an interesting look into what might have been, though.
|Night Creeper Unreleased Figure|
|Clear Snake Eyes Unreleased Figure|
|Clear Stormshadow Unreleased Figure|