In a distant future in which humans live in underground isolation and have every need taken care of by an ubiquitous, omniscient Machine, one man dares to try to see beyond the Machine's omnipotent control. Written long before computers or the instantaneous transmission of images and data, Forster's remarkably foresighted work envisions a world were humans are so dependent on their technology that life without it is almost unimaginable (and trying to imagine it borders on heresy). This episode of the British mid-60's sci-fi anthology series 'Out of the Unknown' is quite well made considering the budget, with imaginative set design and sound, a literate script, and good acting from stars Michael Gothard and Yvonne Mitchell. That the BBC destroyed thousands of hours of quality programming like this to save a bit of space and a few quid is tragic.