Watchworthy

Longest Running Sci-Fi TV Shows

TVs Frank
Updated May 21, 2019 33.7k 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.
Data-driven recommendations based on voting from over 40 million monthly visits to Ranker. Try the free app
Space Patrol is listed (or ranked) 1 on the list Longest Running Sci-Fi TV Shows
Photo: Metaweb (FB)/Fair use

Seasons: 5
Episodes: 1110

Actors: Ed Kemmer, Lyn Osborn, Ken Mayer, Virginia Hewitt, Nina Bara, + more

Premiered: 1950

More Space Patrol 

#40 of 44 The Best TV Shows Set in Space, Ranked #92 of 100 The Greatest TV Shows Set in the Future

Doctor Who is listed (or ranked) 2 on the list Longest Running Sci-Fi TV Shows
Photo: Doctor Who/BBC

Seasons: 37
Episodes: 851

Actors: Christopher Eccleston, David Tennant, Matt Smith, Peter Capaldi, Jodie Whittaker, + more

Premiered: 1963

More Doctor Who 

12 Insane Doctor Who Fan Theories That Actually Make Sense #48 of 807 The Best TV Shows To Binge Watch #129 of 191 The Best Alien Movies Ever Made

Where to watch
The X-Files is listed (or ranked) 3 on the list Longest Running Sci-Fi TV Shows
Photo: The X-Files/Fox

Seasons: 11
Episodes: 218

Actors: David Duchovny, Gillian Anderson, Mitch Pileggi

Premiered: 1993

More The X-Files 

X-Files Storylines That Never Aired #35 of 807 The Best TV Shows To Binge Watch #2 of 69 The Best Crime Fighting Duo TV Series

Where to watch