Trivia: Sherlock's brother Mycroft has an international franchise of restaurants called Diogenes. This is a reference to the Diogenes Club, the gentleman's club Mycroft co-founded in the Holmes short stories.
Trivia: The searching for buried old video game cartridges is based on a true event of Atari burying their failed video game, "E.T." (arguably one of the worst video games ever and leading to the home video game crash). Atari secretly crushed and buried unsold cartridges, which also mistakenly became an urban legend where the idea of the massive burial was regarded only as a myth. In 2013, a company was granted access to the landfill "E.T." was buried in and a documentary was made filming the search and un-burial, also something one of the characters in the episode said he did.
The Hound of the Cancer Cells - S2-E18
Trivia: "The Hound of the Cancer Cells" is a loose reference to "The Hound of the Baskervilles", perhaps the most famous of the four Sherlock Holmes novels.
Answer: I'm the same person who asked this question. I discovered it was Molly Price whom I recognized from Third Watch.
It should be noted Donna was Jim Fowkes‘ secretary. Donna killed Peter.