Forbidden Planet was THE best made Sci fi flick until Aliens.

Disney people did the effects Very cool ship, monster and underground machine. Robbie the robot was priceless. And Leslie Neilson as the Young spaceship captain I actually think the plot is quite good.   

My favourite Sci Fi Film Is Ridley Scott's Blade Runner. Fantastic characters, engaging plot. Eerie alternate reality. Lots of cool effects and great ideas.