I’ve been waiting to do this one. Data as Sherlock Holmes on the holodeck? Yes, please. Geordi is Watson and Pulaski gets kidnapped.

They spend nearly the entire episode in 19th century holodeck London, and that works out just fine. There are some excellent performances from Patrick Stewart, Brent Spiner, and Daniel Davis.

I summarize the plot and point out and explain all the references so you don’t have to.