| Henry Knight |
|Behind the scenes|
|Appearances||"The Hounds of Baskerville"|
|Portrayed by|| Russell Tovey|
Sam Jones(Little Henry Knight)
- "Mr. Holmes, they were the footprints of a gigantic hound!"
- ―Henry Knight [src]
When Henry was a child his father was killed in front of his eyes. Traumatised, he was convinced a monstrous hound killed his dad. Later it was revealed that Bob Frankland was the murderer. Mr Knight knew too much about Dr. Frankland's experiments with chemical weapons. Frankland wore a t-shirt with a picture of a dog and the acronym H.O.U.N.D. which was the reason why Henry rationalized the killer into a monstrous hound. Frankland haunted him during the night, by turning on the security lights repeatedly, which left Henry terrified.