10 Long-Running Sci-Fi Shows That Made One Brilliant Idea Last for Years

Often, it’s high-concept science fiction shows that end up being the best. These are shows driven by a single, easy-to-summarize “what if?” sort of premise, delivering serialized stories over the course of what can end up being several years. Indeed, some of the best long-running sci-fi shows ever (“long-running” here being considered any show that hit the 100-episode milestone at some point) were able to make a single bold idea last for years.