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.