a number of factor make it easy for me to state that i still think this be the most important science fiction film ever make and despite some of the acting and outdated dialogue etc . first and there be the scale of imagination in describe the krell and a humanoid race native to the planet and now all dead and who be 1 million year more advanced than earth human ( u ) and and their technology and particularly the 8 and 000 cubic mile machine . second and there be the music and sound effect and which be inseparable from each other . it create an eerie and unearthly feeling and unlike 2001 and which have traditional classical music . third and it monster be not only the most powerful and deadly ever envision and it also base on real science and doesn not break the law of physic and biology . finally and and most importantly and forbidden planet be the only movie ever make that attempt and and more incredibly and succeed in make an honest and intelligent and mercilessly logical statement on the limit or ceiling of human ( or any other biological entity ) development and no matter how long we survive a a specie . in other word and it predict our inevitable destiny .