Longest Running Sci-Fi TV Shows

TVs Frank
Updated May 21, 2019 31.9k views 11 items

List of the longest-running science fiction TV shows in US history. These sci-fi TV series have more episodes than any others in American television. Some of the shows ran and have since gone off the air or been canceled, while others remain ongoing and are still being produced. Typically, these shows were collected into "seasons" of television, each with a pre-set amount of episodes. Sometimes, these seasons were broken up, in some cases with years or even decades between production of the series, while still being considered the run of a single TV show. (Spin-offs and other shows that were reinvented and debuted as new series are not considered.) This list contains all the longest-running shows in the history of TV science fiction.

Typically, sci-fi has been a difficult genre for TV executives. Though many popular science-fiction shows have steadily built a die-hard following on TV, many of them are cancelled early, often due to the complications and cost of producing a weekly sci-fi adventure series that feels authentic and professional. Many of the sci-fi series now accepted as among the best of all time - from the original "Star Trek" to "Firefly" - have only lasted a few precious seasons.

Check out more lists like the best Sci-Fi novel of all time, the best films set on Mars and the best alien movies ever made.
back to page 1
Stargate SG-1 is listed (or ranked) 5 on the list Longest Running Sci-Fi TV Shows
Photo:  Stargate SG-1/Showtime

Seasons: 10
Episodes: 214

Actors: Richard Dean Anderson, Michael Shanks, Amanda Tapping

Premiered: 1997

More Stargate SG-1 

#102 of 383 The Best TV Shows of The Last 20 Years #41 of 52 Which Nerd Favorite Has The Most Annoying Fans?

Where to watch
The Outer Limits is listed (or ranked) 6 on the list Longest Running Sci-Fi TV Shows
Photo:  Wikimedia Commons (CC-BY)

Seasons: 9
Episodes: 203

Actors: Kevin Conway, Joe Pascual

Premiered: 1995

More The Outer Limits 

#320 of 802 The Best TV Shows To Binge Watch #25 of 312 The Best Sci Fi Television Series of All Time

Where to watch