Best known for his grand, orchestral scores for films like Jaws and Star Wars, John Williams also composed the theme for a beloved '60s sci-fi series.

Kelcie Mattson is a Senior Features author at Collider. Based in the Midwest, she also contributes Lists, reviews, and television recaps. A lifelong fan of niche sci-fi, epic fantasy, Final Girl ...

Sci-fi is an enduring genre on the small screen, even if the budgets couldn't always match the big screen, and these are the best sci-fi shows ever.

If you've watched all the science fiction series on the streaming services you subscribe to, here are some great sci-fi shows ...