Both of tonight's movies rank as seminal works of film. How often can we say that without fear of contradiction? It is a rare day indeed. And both, in different ways, enjoyed inauspicious beginnings.
2001: A Space Odyssey (Pearl, 9.30pm) took nearly three years to film, and when it did finally premiere in the United States the reception was mixed.
One critic remembers the late Rock Hudson stomping from the theatre saying, 'Will somebody please tell me what this is about?' Because, despite all the hype, first-time viewers will quickly realise the most striking thing about this film is that nothing really happens.
It is less a film about men in space, than a film about mankind in space.
The plot is thin at best and the characterisations two-dimensional (the most animated performance comes from HAL, the omnipotent talking computer).
Instead of adventures and baddies and strange creatures from another world, director Stanley Kubrick did something much bolder: he tried to explain the idea of space, space travel and the search for intelligent life away from Earth, using some extraordinary special effects and well-chosen music.
Kubrick's film is not exactly an acquired taste, but it certainly has a narrower appeal than the alternative viewing, Casablanca (World, 9.30pm).