|The Grand Expirement|
|Directed by||John Polson|
|Written by||Robert Doherty & Craig Sweeny|
|Air date||May 15, 2014|
|Running time||43 Min|
|Previous||Art in the Blood|
The Grand Experiment is the twenty-fourth and the finale episode of Season two, and the forty-eighth episode of the series. It was written by Robert Doherty & Craig Sweeny, and directed by John Polson. The episode premiered on May 15, 2014.
Rising tension between Sherlock ( Johnny Lee miller) and Watson (Lucy Liu) bring their partnership to a crossroads, but they endeavor to put their differences aside while they help Sherlock's brother, Mycroft, who faces accusations of treason and murder. Rhys Ifans returns as Mycroft Holmes.
- Jonny Lee Miller as Sherlock Holmes.
- Lucy Liu as Joan Watson.
- Jon Michael Hill as Marcus Bell.
- Aidan Quinn as Tommy Gregson.
- Naseer Faris as Julian Afkhami.