X – the Man with X-Ray Eyes

Corman's intelligent sci-fi movie has a powerful performance from Milland as Dr Xavier, whose experiments with X-Ray eye-drops allow him to cheat at cards, diagnose patients' internal complaints, and see through women's clothing (fortunately for them, they're all standing with their naughty bits shielded by inexplicably opaque plants and pieces of furniture). As the treatment continues, however, Milland becomes terrified as he starts to see beyond the material world into the heart of the universe. The rudimentary special effects and cheapo production notwithstanding, this is an undoubted cult classic.