Which NCIS episode had a Sherlock reference?

I am a big fan of both Sherlock and NCIS and I remember there was one episode of NCIS where Fornell says hes glad he watched Sherlock (he was just abo

I am a big fan of both Sherlock and NCIS and I remember there was one episode of NCIS where Fornell says he's glad he watched Sherlock (he was just about to go to England for something) and he mentions the Hound of the Baskervilles or something and then Vance calls him Dr. Watson but I can't remember which episode it was! Please tell me if you know!

or:I am a big fan of both Sherlock and NCIS and I remember there was one episode of NCIS where Fornell says he's glad he watched Sherlock (he was just about to go to England for something) and he mentions the Hound of the Baskervilles or something and then Vance calls him Dr. Watson but I can't remember which episode it was! Please tell me if you know!

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