Why to watch:
Only six brilliant episodes long, "Sherlock" is the best thing you haven't watched yet -- if indeed you still haven't watched it. Starring Benedict Cumberbatch as Sherlock Holmes and Martin Freeman as John Watson, the modern day retelling of Arthur Conan Doyle's stories is sharp and fantastic. Just wait until you get to Season 2's "A Scandal in Bohemia," because there's no going back after that.
Where to watch: Amazon Instant Video
When to watch by:
October 2013, when "Sherlock" returns at long last with Season 3.