On this day in movie history - Phase IV (1974):

Phase IV

directed by Saul Bass,

written by Mayo Simon,

inspired by the short story Empire of the Ants by H. G. Wells,

was released in the United States on September 6, 1974.
Music by Brian Gascoigne.

Cast:
Nigel Davenport, Michael Murphy, Lynne Frederick, Alan Gifford, Robert Henderson, Helen Horton, David Healy.

On this day in movie history - Alien (1979):

Alien,

directed by Ridley Scott,

written by Dan O'Bannon,

based on a story by Dan O'Bannon and Ronald Shusett,

was released in the United States on May 25, 1979.
Music by Jerry Goldsmith.

Cast:
Sigourney Weaver, Tom Skerritt, Veronica Cartwright, Harry Dean Stanton, John Hurt, Ian Holm, Yaphet Kotto, Bolaji Badejo, Helen Horton, Eddie Powell.