After nearly 60 years and 13 incarnations, it's no surprise that The Doctor has accumulated a long list of enemies. Most episodes revolve around a monster of the week that The Doctor easily thwarts, but some popular monsters recur through one or more seasons. Almost every Doctor has one foe they must persistently fight. For example, the Eleventh Doctor had multiple battles with the Weeping Angels and the Silence, while the Twelfth Doctor tangled with the Cybermen until the very end.