This category is for Cybermen. Please do not over-categorize this category. Under no circumstances should this category be placed in "Enemy of <X>" categories — especially of the various Doctors — as it completely overburdens the category structure of this wiki. Given the number of pages that are related to both the Cybermen and the Doctors, placing Category:Cybermen within Category:First Doctor enemies, et al, totally breaks the category structure of the wikia. Instead, place the page Cybermen within those "enemies" categories.