Great sci-fi shows contain rich themes that challenge audiences, like in heavy episodes of Doctor Who, The X-Files, Westworld, and Black Mirror.

Find out which sci-fi shows are the best for rewatches based on their compelling narratives and character development, from Doctor Who to Dark.

Part of what makes Lost such a rewarding rewatch in 2026 is that it doesn't feel dated. The series still looks and sounds incredible. Because it was filmed on 35mm, which can be upscaled and ...