10. The Gelth
This is a typical case of a bad decision made by the Doctor. In it, Nine and Rose Tyler confront the Gelth. After the TARDIS “accidently” landed them in 1869 Cardiff, the pair teamed up with Charles Dickens, a burial service parlor proprietor named Gabriel Sneed, and his telepathic servant Gwyneth to solve a mystery. Together, they explored a series of possessions that were transforming dead bodies into the strolling dead.
The Doctor utilized Gwyneth’s forces to speak with the obscure substances. He found out that they were individuals from the Gelth, an alien race decimated in the Time War. Their requests for help made The Doctor open the rift in the cellar of the funeral home. The Gelth would utilize the cadavers as impermanent vessels until they found another planet and innocent people would quit getting killed. Everybody winds up happy, isn’t that so?
Not at all. It was a trap by the Gelth, who were much bigger in number and prepared to slaughter everybody on Earth so they could assume control. This led to the death of both Sneed and Gwyneth. Thankfully, Charles Dickens drew out the creatures from host bodies using gas, and Gwyneth blew every one of them to bits. They were pretty unsettling.
9. The Kantrofarri
The Kantrofarri, also called “dream crabs,” are truly the stuff from your nightmares. These ruthless animals jump from the roof, wrap themselves around your face and use telepathy to constrain you into a euphoric dream while they liquefy your mind for dinner. Yikes!
They made their frightening debut in “Last Christmas” in 2014. In it The Doctor, Clara, and a pack of North Pole scientists are trapped by what look like claws of a demon.
The Kantrofarri have a ton going for them in the department of monstrosity. They have a twisted appearance, capacity to prey on the subconscious and an ability to drag their victims into an Inception rabbit hole containing various layers of dream. Remember, all the while they are eating their victim’s cerebrum. This surely earns them a spot on this rundown.