Humanity finds a mysterious, obviously artificial object buried beneath the Lunar surface and, with the intelligent computer H.A.L. 9000, sets off on a quest. (IMDb)
Often boring, but ambitiously and provokingly so (see the minutes of black to open the film), with an active score at times triumphant (see the ape smashing bones), at others filling you with dread (see the screeching choir accompanying the monolith). The visuals are excellent (see the reflecting helmet), as are the actors (Dullea is a wonderful lead), and the plot whenever it appears (HAL is a uniquely intimidating villain; his unplugging is a superb scene, as is the eerily beautiful ending).