Discover the 20 best sci-fi TV shows from the past two decades, featuring iconic series like Stranger Things, Black Mirror, ...

According to IMDb users, sci-fi shows like Firefly, Lost, and Star Wars: The Clone Wars were some of the best series during the 2000s.

We viewers are fortunate to have so many sci-fi TV shows to watch. Every year, there are dozens of new worthwhile shows to watch, from expansive galactic adventures to futuristic takes on ...