Fan Casting Metalhead in Teenage Mutant Ninja Turtles: Mutant Warriors

A creation of Donatello's from reverse engineered tech from Krang's fortress, the Technodrome, Metalhead as Mikey called him was designed to help Donnie with his feeling his arsenal wasn't enough in the fight with Shredder and Krang. Over time, he began to see he was wrong, and Metalhead became a training partner for the Turtles. Due to the advanced technology he is made of, Metalhead's AI has evolved to give him free will, and now he uses his vast arsenal to help the Turtles in battle when necessary.