For every Transformer that makes it to store shelves, there are always some that fall by the wayside. Lines get canceled, retailers back off on exclusives, designs go over budget, focus groups pass on a concept, or maybe they just weren't cool enough. Regardless of the whys and wherefores, this article aims to document the unreleased toys that never quite saw retail. Note that this list will likely never be "complete," as for every concept design that makes it into collectors' hands, a countless number wind up in the garbage can.