Science fiction television has evolved since the 1950s. Early anthology series and space operas in the 1950s featured simplistic narratives and characters. In the 1960s, shows began tackling social issues and attracting adult audiences. Pioneering shows of this era were filmed on studio lots using established talent. They embedded anxieties about the Cold War and space race. Between the 1960s and 1990s, sci-fi television explored dystopian futures, alien encounters, time travel, technology, and alternate realities both positively and negatively. Modern sci-fi television mixes genres freely and experiments with narrative structures while maintaining a sense of wonder and interrogating human nature.