On this day in the Star Trek universe:

Star Trek: The Next Generation (1988)

Star Trek: The Next Generation

Season 2. Episode 3.

Episode entitled: Elementary, Dear Data.

Released December 5, 1988.

Directed by Rob Bowman.

Written by Brian Alan Lane, inspired by characters created by Arthur Conan Doyle.

Created by Gene Roddenberry.

Music by Dennis McCarthy.

Cast: Patrick Stewart, Jonathan Frakes, LeVar Burton, Michael Dorn, Marina Sirtis, Brent Spiner, Wil Wheaton, Diana Muldaur, Daniel Davis, Alan Shearman, Biff Manard, Diz White, Anne Elizabeth Ramsay, Richard Merson, Rosemarie Baio, Majel Barrett, Michael Braveheart, Jeffrey Deacon, Guy Vardaman, Mark Wilson.