Some concepts are hard-wired for the medium they debuted in. Movie studios make endless efforts to bring profitable concepts from books, TV, video games, or cartoons into their revenue streams, but they can't always solve that puzzle. Despite regular failures, IP-holders rarely give up on a theoretically fun idea. That persistence raises questions when fans see an untapped market. Hollywood loves CGI-driven epic blockbusters, so why don't they make a good mecha movie?