Last Updated on 18 March 2024

The following list is the Official Definitive List of the 300 best sci-fi shows of all time.

I found 26 different ranked lists online of “best sci-fi TV shows of all time” and pulled them all into Excel and merged them all to get this definitive compilation. See my Methodology page for the research process that was used, including links to the 26 lists that were averaged. Below is a checklist you can print out, followed by the ranked list.

1. The Twilight Zone (1959-1964)
2. Battlestar Galactica (2004-2009)
3. Doctor Who (1963-present)
4. Star Trek: The Next Generation (1987-1994)
5. Star Trek (1966-1969)
6. Firefly (2002-2003)
7. The X-Files (1993-2002, 2016-2018)
8. The Mandalorian (2019-present)
9. Black Mirror (2011-present)
10. The Expanse (2015-2021)
11. Stranger Things (2016-present)
12. Westworld (2016-present)
13. Stargate SG-1 (1997-2007)
14. Fringe (2008-2013)
15. Babylon 5 (1993-1998)
16. Star Trek: Deep Space Nine (1993-1999)
17. The Prisoner (1967-1968)
18. Futurama (1999-2013)
19. Lost (2004-2010)
20. Quantum Leap (1989-1993)
21. The Outer Limits (1963-1965)
22. Severance (2022-present)
23. Rick and Morty (2013-present)
24. Farscape (1999-2003)
25. Orphan Black (2013-2017)
26. Watchmen (2019)
27. Batman: The Animated Series (1992-1995)
28. Cowboy Bebop (1998-1999)
29. V (1984-1985)
30. Andor (2022-present)
31. Legion (2017-2019)
32. The Handmaid’s Tale (2017-present)
33. The Boys (2019-present)
34. Star Trek: Strange New Worlds (2022-present)
35. Red Dwarf (1988-present)
36. Buffy the Vampire Slayer (1997-2003)
37. Star Trek: Discovery (2017-2024)
38. Star Trek: Voyager (1995-2001)
39. Neon Genesis Evangelion (1995-1996)
40. Star Wars: The Clone Wars (2008-2020)
41. Torchwood (2006-2011)
42. Mystery Science Theater 3000 (1988-1999)
43. The 100 (2014-2020)
44. The Last of Us (2023-present)
45. Life on Mars (2006-2007)
46. Counterpart (2017-2019)
47. The Hitchhiker’s Guide to the Galaxy (1981)
48. Altered Carbon (2018-2020)
49. The Man in the High Castle (2015-2019)
50. Steins;Gate (2011-2015)
51. Sense8 (2015-2018)
52. Silo (2023-present)
53. Buck Rogers in the 25th Century (1979-1981)
54. Terminator: The Sarah Connor Chronicles (2008-2009)
55. Timeless (2016-2018)
56. Star Trek: Enterprise (2001-2005)
57. Stargate: Atlantis (2004-2009)
58. Star Trek: Picard (2020-2023)
59. Station Eleven (2021-2022)
60. For All Mankind (2019-present)
61. Eureka (2006-2012)
62. Dragon Ball Z (1989-1996)
63. Humans (2015-2018)
64. Dollhouse (2009-2010)
65. Lost in Space (1965-1968)
66. Agents of S.H.I.E.L.D. (2013-2020)
67. The Jetsons (1962-1963)
68. Dark (2017-2020)
69. Sliders (1995-2000)
70. The Six-Million Dollar Man (1974-1978)
71. Samurai Jack (2001-2017)
72. Mrs. Davis (2023)
73. Mork & Mindy (1978-1982)
74. Caprica (2009-2010)
75. The 4400 (2004-2007)
76. One Punch Man (2015-2019)
77. The Orville (2017-2022)
78. Falling Skies (2011-2015)
79. Space: 1999 (1975-1977)
80. Utopia (2013-2014)
81. Devs (2020)
82. Stargate Universe (2009-2011)
83. Colony (2016-2018)
84. Lost in Space (2018-2021)
85. Fullmetal Alchemist: Brotherhood (2009-2010)
86. Daredevil (2015-2018)
87. The OA (2016-2019)
88. The Twilight Zone (2019-2020)
89. Space: Above and Beyond (1995-1996)
90. Dark Matter (2015-2017)
91. Max Headroom (1987-1988)
92. Person of Interest (2011-2016)
93. Warehouse 13 (2009-2014)
94. 12 Monkeys (2015-2018)
95. Aeon Flux (1991-1995)
96. Roswell (1999-2002)
97. Continuum (2012-2015)
98. Terra Nova (2011)
99. Lexx (1996-2002)
100. Justice League Unlimited (2004-2006)
101. Misfits (2009-2013)
102. Now and Again (1999-2000)
103. The Twilight Zone (1985-1989)
104. Twin Peaks (1990-1991)
105. Electric Dreams (2017-2018)
106. The Flash (2014-2023)
107. Battlestar Galactica (1978-1979)
108. Travelers (2016-2018)
109. The Peripheral (2022)
110. Blake’s 7 (1978-1981)
111. Dark Angel (2000-2002)
112. Thunderbirds (1965-1966)
113. Invincible (2021-present)
114. Mr. Robot (2015-2019)
115. Foundation (2021-present)
116. Star Blazers (1979-1984)
117. Almost Human (2013-2014)
118. Adventure Time (2010-2018)
119. Killjoys (2015-2019)
120. Invader ZIM (2001-2006)
121. Jessica Jones (2015-2019)
122. Young Justice (2010-2022)
123. Supernatural (2005-2020)
124. Better Off Ted (2009-2010)
125. Primeval (2007-2011)
126. Agent Carter (2015-2016)
127. Millennium (1996-1999)
128. Defiance (2013-2015)
129. Ghost in the Shell: Stand Alone Complex (2002-2005)
130. 3rd Rock from the Sun (1996-2001)
131. Alien Nation (1989-1990)
132. Mystery Science Theater 3000: The Return (2017-2022)
133. Star Wars: Rebels (2014-2018)
134. SeaQuest 2032 (1993-1996)
135. War of the Worlds (2019-2022)
136. Knight Rider (1982-1986)
137. ALF (1986-1990)
138. The Venture Bros. (2003-2018)
139. Harley Quinn (2019-present)
140. Resident Alien (2021-present)
141. The Leftovers (2014-2017)
142. The Quatermass Experiment (1953)
143. The Twilight Zone (2002-2003)
144. Dragon Ball (1995-2003)
145. 11.22.63 (2016)
146. Love, Death & Robots (2019-present)
147. Astro Boy (1963-1965)
148. The Middleman (2008)
149. Future Man (2017-2020)
150. People of Earth (2016-2017)
151. Land of the Lost (1974-1977)
152. Gravity Falls (2012-2016)
153. Planet of the Apes (1974)
154. Obi-Wan Kenobi (2022)
155. Regular Show (2010-2017)
156. Smallville (2001-2017)
157. Arcane (2021-present)
158. Loki (2021-2023)
159. Supergirl (2015-2021)
160. Star Trek: The Animated Series (1973-1975)
161. Paper Girls (2022)
162. Star Wars: The Bad Batch (2021-2024)
163. Andromeda (2000-2005)
164. The Bionic Woman (1976-1978)
165. Raised by Wolves (2020-2022)
166. Final Space (2018-2021)
167. Upload (2020-present)
168. The Tick (1994-1997)
169. The Wild Wild West (1965-1969)
170. Nowhere Man (1995-1996)
171. American Gods (2017-2021)
172. The Walking Dead (2010-2022)
173. X-Men: The Animated Series (1992-1997)
174. Earth: Final Conflict (1997-2002)
175. The Falcon and the Winter Soldier (2021)
176. Star Wars: Visions (2021-present)
177. Spider-Man: The Animated Series (1994-1998)
178. Erased (2016)
179. The Punisher (2017-2019)
180. The Rain (2018-2020)
181. Gen V (2023-present)
182. The Legend of Korra (2012-2014)
183. Violet Evergarden (2018)
184. Logan’s Run (1977-1978)
185. Dirk Gently’s Holistic Detective Agency (2016-2017)
186. The Midnight Gospel (2020)
187. Night Sky (2022)
188. Jericho (2006-2008)
189. The Adventures of Brisco County, Jr. (1993-1994)
190. The Invaders (1967-1968)
191. Heroes (2006-2010)
192. Arrow (2012-2020)
193. Gotham (2014-2019)
194. Alias (2001-2006)
195. The Outer Limits (1995-2002)
196. Moonhaven (2022)
197. The Last Man on Earth (2015-2018)
198. Ahsoka (2023-present)
199. Forever (2014-2015)
200. Lois & Clark: The New Adventures of Superman (1993-1997)
201. V: The Final Battle (1984)
202. Under the Dome (2013-2015)
203. Battle of the Planets (1978-1980)
204. Red vs. Blue (2003-2024)
205. The Silent Sea (2021)
206. Halo (2022-present)
207. Justice League (2001-2004)
208. Tales from the Loop (2020)
209. Made for Love (2021-2022)
210. The Transformers (1984-1987)
211. In from the Cold (2022)
212. The Book of Boba Fett (2021-2022)
213. Sanctuary (2008-2011)
214. Project Blue Book (2019-2020)
215. Superman & Lois (2021-2024)
216. Lovecraft Country (2020)
217. Mighty Morphin Power Rangers (1993-1996)
218. Mobile Suit Gundam (1979-1980)
219. From (2022-present)
220. Trollhunters: Tales of Arcadia (2016-2018)
221. Peacemaker (2022-present)
222. The Umbrella Academy (2019-2024)
223. The Man Who Fell to Earth (2021-2022)
224. Get Smart (1965-1970)
225. Monarch: Legacy of Monsters (2023-present)
226. Black Lightning (2017-2021)
227. Jake 2.0 (2003-2004)
228. Twisted Metal (2023-present)
229. Extraordinary (2023-present)
230. The Strain (2014-2017)
231. V (2009-2011)
232. Awake (2012)
233. Sweet Tooth (2021-present)
234. Solar Opposites (2020-present)
235. Helix (2014-2015)
236. Voyage to the Bottom of the Sea (1964-1968)
237. Revolution (2012-2014)
238. Code Geass (2006-2008)
239. Years and Years (2019)
240. Ashes to Ashes (2008-2010)
241. Pinky and the Brain (1995-1998)
242. Dexter’s Laboratory (1996-2003)
243. Gintama (2005-2021)
244. Ms. Marvel (2022)
245. Mr. Mercedes (2017-2019)
246. Mouse (2021)
247. WandaVision (2021)
248. Extant (2014-2015)
249. Alice in Borderland (2020-present)
250. His Dark Materials (2019-2022)
251. Homecoming (2018-2020)
252. Wynonna Earp (2016-2021)
253. Doom Patrol (2019-2023)
254. Earth 2 (1994-1995)
255. Titans (2018-2023)
256. Star Trek: Lower Decks (2020-present)
257. Flashforward (2009-2010)
258. Teenage Mutant Ninja Turtles (2003-2010)
259. Pantheon (2022-2023)
260. Haven (2010-2015)
261. Captain Video and His Video Rangers (1949-1955)
262. Farscape: The Peacekeeper Wars (2003-2004)
263. Mob Psycho 100 (2016-2022)
264. The Sandman (2022-present)
265. Limitless (2015-2016)
266. FLCL (2000-2001)
267. Castle Rock (2018-2019)
268. Maniac (2018)
269. Wayward Pines (2015-2016)
270. Chuck (2007-2012)
271. UFO (1970-1971)
272. Another Life (2019-2021)
273. Robotech (1985)
274. Something Is Out There (1988-1989)
275. Voltron: Defender of the Universe (1984-1985)
276. Survivors (2008-2010)
277. Detective Conan (1996-present)
278. Cold Lazarus (1996)
279. RoboCop (1994)
280. Charmed (1998-2006)
281. Fullmetal Alchemist (2003-2004)
282. Luke Cage (TV Series 2016-2018)
283. Amazing Stories (2020)
284. Raising Dion (2019-2022)
285. Saint Seiya: Knights of the Zodiac (1986-1989)
286. Sisyphus: The Myth (2021)
287. Jason of Star Command (1978-1981)
288. Last Resort (2012-2013)
289. Snowpiercer (2020-2025)
290. Highlander (1992-1998)
291. Scavengers Reign (2023)
292. Made in Abyss (2017-present)
293. Archive 81 (2022)
294. Paradise City (2021-present)
295. The Defenders (2017)
296. The New Batman Adventures (1997-1999)
297. The Spectacular Spider-Man (2008-2009)
298. Whiz Kids (1983-1984)
299. Biohackers (2020-2021)
300. Into the Night (2020-2021)