Some excellent original science fiction stories include 'Foundation' by Isaac Asimov. It's about a mathematician who tries to shorten the dark ages of a future galactic empire. 'Dune' by Frank Herbert is a complex and epic story set in a desert planet with political intrigue and the use of a special spice. 'The Hitchhiker's Guide to the Galaxy' by Douglas Adams is a hilarious and unique take on science fiction, following the misadventures of an earthling in a very strange universe.
One great original science fiction story is 'Frankenstein' by Mary Shelley. It explores the creation of life and the moral implications. Another is 'The War of the Worlds' by H.G. Wells, which tells of a Martian invasion. 'Ender's Game' by Orson Scott Card is also notable. It delves into military strategy and the psychological state of a child prodigy in a future setting.
Well, '1984' by George Orwell can be considered an original and influential science fiction story. It depicts a dystopian future where the government has total control over people's lives. 'Brave New World' by Aldous Huxley is also a classic. It shows a world where people are genetically engineered and conditioned for specific social roles. And then there's 'Neuromancer' by William Gibson, which was very innovative in its portrayal of a cyberpunk future.