The Doctor has many enemies some more dangerous than others. Let's see The Doctor's top 5 enemies!
#5 The Weeping AnglesEditComing in at number five we have The Weeping Angles. Also known as The Lonely Assassins, The Weeping Angles have the ability to send other beings into the past. This allows the Angels to feed on the potential time energy of what would have been the rest of their victim's lives. The Angels are quantum locked. This means that they can only move when no other living creature, including their own kind, is looking at them. As soon as they are observed, they instantly turn to stone and cannot be killed. The Angles are fast so when you are looking at them you can't turn around or even blink. The moment you do that your dead. They first appear in the episode called "Blink".
#4 The Silence EditNext we have The Silence. If you see a Silent, you won't know you've spotted it beacuse Silence somehow edit themselves from an observer's memory. See one of these creatures and the moment it's out of view you won't remember anything about it. The Silence first episode was called "The Prequel to the Impossible Astronaut".
#3 CybermenEditNow we move on to the Cybermen. The Cybermen were originally human beings, but gradually they replaced their weak flesh with metal and plastic. In the process they lost their compassion, along with all other emotions. They have the ability to shoot lasers. Cybermen first appeared on the episode called "The Tenth Planet".
#2 DaleksEditAt number two we have the Daleks. The Daleks were born without any ability to feel compassion or pity and were motivated only by hate, fear, and a belief that they were the superior creatures in the Universe. They are a life long enemy of The Doctor because of the Time War where the Daleks and Timelords fought their biggest battle against eachother. Daleks can fly, shoot lasers, and teleport through emergnacy temporal shift. Their debut episode was called "The Daleks".
#1 The MasterEditComing in at number one we have The Doctor's worst enemy The Master. The Master is a Time Lord from the planet Gallifrey, just like the Doctor. But unlike The Doctor he chose to travel the universe causing chaos and revelling in wickedness on an epic scale. The Doctor and The Master grew up together on Gallifrey so The Doctor wants to make The Master good since they are the only two Timelords left. He feels like it is his responsibility to look after The Master but he is out of control and has no intentions of stopping his madness. The Master's debut episode was called "Terror of the Autons".