Throughout the years, science fiction has showcased visions of a possible future, based on the issues of the day. During the tumultuous 1970s, science fiction once again led the way in producing inspiring and thought-provoking stories of humanity’s purpose and possibilities. Experience it all again with these five highlights.A Clockwork Orange (1971): Stanley Kubrick’s adaptation of Anthony Burgess’s novel is still shocking in its violence and social criticism. A young thug rules his gang of cronies until he’s caught and subjected to a controversial new treatment. But is the cure worse than the problem? You won’t find any aliens or spaceships herejust technology that still seems all too possible.Sleeper (1973): Woody Allen’s entry into the sci-fi genre is just as funny as his other 1970s films, but is set against a backdrop of a technological dystopia and some cutting commentary on how human interactions may changeand how they’ll stay the same.Soylent Green (1973): Richard Fleischer directed this dystopian thriller, starring Charlton Heston and Edward G. Robinson in his last film. Set in 2022, the film follows a New York detective who must deal with overpopulation and pollution while investigating the murder of a prominent businessman. Soylent Green is best known for its often-parodied ending, but there’s much more to it then that.The Stepford Wives (1975): The housewives in Stepford are not what they seem. The science-fiction aspect of the film isn’t apparent until the endfor the majority of the movie, the film simply questions the traditional gender roles of the ages. Many issues are raised, but as with the greatest films, there are few direct answers to be found.Alien (1979): Even if it hadn’t spawned a franchise, Alien would still be notable for its unique blending of sci-fi and horror elements. Set entirely on the spaceship Nostromo, Alien revels in its sci-fi nature, including cryogenic storage, artificial intelligence, and, of course, the titular creatures.