15 Years Ago, 'Doctor Who' Perfected A Classic Sci-Fi Trope
Doctor Who adapts classic sci-fi premises by inserting the Doctor into them, using synthetic replicas that gain independence and threaten their creators.
70 Years Ago, A Creepy Thriller Spawned An Infamous Sci-Fi Trope
A small town is overtaken by emotionless duplicates grown from alien seedpods, creating paranoia as neighbors are silently replaced and social trust collapses.