On this day in the Star Trek universe:

Star Trek (1966 & 1967)

Star Trek

Season 1. Episode 13.

Episode entitled: The Conscience of the King.

Released December 8, 1966.

Directed by Gerd Oswald.

Written by Barry Trivers.

Created by Gene Roddenberry.

Music by Alexander Courage, Joseph Mullendore.

Cast: William Shatner, Leonard Nimoy, Nichelle Nichols, DeForest Kelley, Arnold Moss, Barbara Anderson, Grace Lee Whitney, William Sargent, Natalie Norwick, David Somerville / David-Troy, Karl Bruck, Marc Grady Adams, Bruce Hyde, Tom Anfinsen, Majel Barrett, Bill Blackburn, Frank da Vinci, Carey Foster, Robert H. Justman, Jeannie Malone, Eddie Paskey, Ron Veto.

Star Trek

Season 2. Episode 12.

Episode entitled: The Deadly Years.

Released December 8, 1967.

Directed by Joseph Pevney.

Written by David P. Harmon.

Created by Gene Roddenberry.

Music by Alexander Courage.

Cast: William Shatner, Leonard Nimoy, Nichelle Nichols, DeForest Kelley, James Doohan, George Takei, Charles Drake, Sarah Marshall, Majel Barrett, Walter Koenig, Felix Locher, Carolyn Nelson, Laura Wood, Beverly Washburn, Frank da Vinci, Roger Holloway, Eddie Paskey, Frieda Rentie.