Television Entity

The Television Entity was one of four mysterious beings inhabiting Towell Farm on the orders of Scooter 2000. It was the most dangerous of the four, coming closest to killing the Doctor.

Biography
The Television Entity turned itself on when the Doctor entered the living room. After slowly building up to the full experiencing, it finally unleashed its most haunting images and sound, bringing the Doctor to the ground and piercing his very mind. After resisting for long enough, the haunting sounds and pictures stopped and the entity faded away. It is unknown what happened to it, but carnival music resembling the same one it made could be heard as the Doctor departed Devon. (Horror at Towell Farm)

Trivia

 * Doherty considers the trippy sequence with the entity in it to be the best scene in Horror at Towell Farm, as it comes closest to being genuinely scary in his opinion.
 * A sound clip of William Afton from Five Nights at Freddy's screaming can be heard amongst the other creepy tunes and noises.