Star Trek: The Next Generation

Season 2, Episode 3

Episode Title: Elementary, Dear Data

Air Date: 1988-12-05

Overview:

Stardate: 42286.3. Data and Geordi become involved with a holodeck program about Sherlock Holmes and his investigations, when they create Sherlock's arch nemesis, Moriarty; however, modifications to the Moriarty character include the capability of out-smarting Data, which leads to some unexpected consequences.