Manga and Anime
In the Japanese anime adaptation Mutant Turtles: Choujin Densetsu-hen, the backstory from the original cartoon was preserved. Unlike the rest of the main cast, Shredder's appearance was changed to match the Supermutants Shredder toy that was being sold at that time. The manga explained this by saying his original outfit was destroyed in a battle with the Turtles and Krang created the new armor for him. Shredder also gains the ability to transform into the dragon Devil Shredder using the Mutanite crystals he stole from the Neutrinos. With the energy from the evil sprite Dark Mu, he was later able to transform into the gigantic Dark Devil Shredder. In the second volume of the anime he gets his Tiger Spirit Metal Mutant armor. He was voiced by Kiyoyuki Yanada.
Read more about this topic: Master Shredder