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Star Trek: The Next Generation episode
“Elementary, Dear Data”
Original Air Date	December 3, 1988
Season	2
Episode #	3
Production #	2.3
Writer(s)	Brian Alan Lane
Director	Rob Bowman
Guest star(s)	Daniel Davis Alan Shearman Biff Manard Diz White Anne Ramsay Richard Merson
Episode Order
Previous	Next
"Where Silence Has Lease"	"The Outrageous Okona"

Elementary, Dear Data is the third episode of Star Trek: The Next Generation season 2.

Summary

Geordi asks the computer to create a variation on Sir Arthur Conan Doyle's character Moriarty, that will be able to defeat Data in his role as Sherlock Holmes. The character that emerges surprises them both.