"Machine侠" can be translated to "Machine Hero" in English. However, if you are referring to a specific title or name like a movie or a character that is popularly known as "机器侠", it might have an official English title. For instance, the 2009 Chinese sci-fi comedy film "机器侠" is officially titled "A Chinese Odyssey Part Four: Patriotism" in English, but this doesn't directly translate as "Machine Hero". If it's a different context, sticking with "Machine Hero" would be appropriate.