On this day in movie history - Star Trek VI: The Undiscovered Country (1991):

Star Trek VI: The Undiscovered Country

directed by Nicholas Meyer,

written by Nicholas Meyer and Denny Martin Flinn,

based on a story by Leonard Nimoy, Lawrence Konner and Mark Rosenthal,

was released in the United States on December 6, 1991.
Music by Cliff Eidelman.

Cast:

William Shatner, Leonard Nimoy, DeForest Kelley, James Doohan, George Takei, Walter Koenig, Nichelle Nichols, Kim Cattrall, Christopher Plummer, David Warner, Rosanna DeSoto, Iman, Christian Slater, Brock Peters, René Auberjonois, Michael Dorn.

On this day in movie history - Star Trek: The Motion Picture (1979):

Star Trek: The Motion Picture

directed by Robert Wise,

written by Harold Livingston,

based on a story by Alan Dean Foster,

was released in the United States on December 6, 1979.
Music by Jerry Goldsmith.

Cast:

William Shatner, Leonard Nimoy, DeForest Kelley, James Doohan, Walter Koenig, Nichelle Nichols, George Takei, Persis Khambatta, Stephen Collins, Majel Barrett, Grace Lee Whitney, David Gautreaux, Mark Lenard.

On this day in movie history - Star Trek IV: The Voyage Home (1986):

Star Trek IV: The Voyage Home

directed by Leonard Nimoy,

written by Steve Meerson, Peter Krikes, Nicholas Meyer and Harve Bennett,

based on a story by Harve Bennett and Leonard Nimoy,

was released in the United States on November 26, 1986.
Music by Leonard Rosenman.

Cast:

William Shatner, Leonard Nimoy, DeForest Kelley, James Doohan, George Takei, Walter Koenig, Nichelle Nichols, Catherine Hicks, Majel Barrett, Mark Lenard, Jane Wyatt, Robin Curtis, Alex Henteloff, Madge Sinclair, Jane Wiedlin, Vijay Amritraj, John Schuck, Robert Ellenstein, Michael Berryman, Brock Peters, Grace Lee Whitney.