The 156 Best Episodes of Star Trek

As promised I've gone through the data from IMDB for all the Star Trek series, and found the best episodes across all the series.  I took the top 25% of episodes in each series and combined them.  Then I cut it off to only those episodes that had a rating of 8 or above, which only cut off a dozen or so episodes.  Here are the episodes, sorted by series and then air date.  I'd add you should probably watch any two part episodes, even if they aren't listed, because they are usually both good and important to the plot.  In DS9 the ending arc begins with S7E16, and even though some didn't make the cut, skipping any of those would be madness.

I've previously written some overviews of each series, so maybe couple that with this.

Series	Episode	Rating	Num Ratings	Title
TOS	S01E10	8.1	877	The Corbomite Maneuver
TOS	S01E11	8.4	854	The Menagerie: Part I
TOS	S01E12	8.3	806	The Menagerie: Part II
TOS	S01E14	8.6	1042	Balance of Terror
TOS	S01E18	8	805	Arena
TOS	S01E22	8.6	1083	Space Seed
TOS	S01E23	8	739	A Taste of Armageddon
TOS	S01E25	8.3	787	The Devil in the Dark
TOS	S01E26	8.1	717	Errand of Mercy
TOS	S01E28	8.7	1326	The City on the Edge of Forever
TOS	S02E01	8.6	871	Amok Time
TOS	S02E04	8.6	981	Mirror, Mirror
TOS	S02E06	8.7	845	The Doomsday Machine
TOS	S02E10	8.5	687	Journey to Babel
TOS	S02E15	8.6	960	The Trouble with Tribbles
TOS	S03E02	8.4	665	The Enterprise Incident
TOS	S03E23	8.1	578	All Our Yesterdays
TNG	S01E24	8.1	669	Conspiracy
TNG	S02E03	8.1	697	Elementary, Dear Data
TNG	S02E08	8	607	A Matter of Honor
TNG	S02E09	8.6	882	The Measure of a Man
TNG	S02E16	8.5	834	Q Who?
TNG	S03E10	8.2	638	The Defector
TNG	S03E13	8.4	678	Déjà Q
TNG	S03E15	8.5	1019	Yesterday's Enterprise
TNG	S03E16	8.1	685	The Offspring
TNG	S03E17	8.1	571	Sins of the Father
TNG	S03E23	8.1	585	Sarek
TNG	S03E26	8.6	1074	The Best of Both Worlds: Part 1
TNG	S04E01	8.6	958	The Best of Both Worlds: Part 2
TNG	S04E07	8.3	570	Reunion
TNG	S04E11	8.1	583	Data's Day
TNG	S04E12	8	545	The Wounded
TNG	S04E14	8.2	607	Clues
TNG	S04E21	8.1	612	The Drumhead
TNG	S04E26	8.3	550	Redemption
TNG	S05E01	8.2	545	Redemption II
TNG	S05E02	8.4	780	Darmok
TNG	S05E07	8.3	562	Unification I
TNG	S05E08	8.3	549	Unification II
TNG	S05E14	8.3	563	Conundrum
TNG	S05E18	8.7	771	Cause and Effect
TNG	S05E23	8.5	662	I Borg
TNG	S05E24	8.1	533	The Next Phase
TNG	S05E25	8.5	1462	The Inner Light
TNG	S05E26	8.2	575	Time's Arrow: Part 1
TNG	S06E01	8.2	587	Time's Arrow: Part 2
TNG	S06E04	8.4	617	Relics
TNG	S06E10	8.2	587	Chain of Command: Part 1
TNG	S06E11	8.6	611	Chain of Command: Part 2
TNG	S06E12	8.5	593	Ship in a Bottle
TNG	S06E15	8.7	689	Tapestry
TNG	S06E21	8.2	538	Frame of Mind
TNG	S06E25	8.5	546	Timescape
TNG	S06E26	8.2	499	Descent: Part 1
TNG	S07E11	8.6	599	Parallels
TNG	S07E12	8.3	518	The Pegasus
TNG	S07E15	8.3	577	Lower Decks
TNG	S07E25	8.4	4923	All Good Things...
DS9	S01E18	8.7	505	Duet
DS9	S02E08	8.2	337	Necessary Evil
DS9	S02E14	8.2	337	Whispers
DS9	S02E19	8	323	Blood Oath
DS9	S02E22	8	320	The Wire
DS9	S02E23	8	314	Crossover
DS9	S02E26	8.5	326	The Jem'Hadar
DS9	S03E01	8.2	323	The Search: Part 1
DS9	S03E02	8	317	The Search: Part 2
DS9	S03E09	8	314	Defiant
DS9	S03E20	8.5	337	Improbable Cause
DS9	S03E21	8.6	346	The Die Is Cast
DS9	S03E26	8.2	299	The Adversary
DS9	S04E01	8.6	429	The Way of the Warrior
DS9	S04E02	8.7	653	The Visitor
DS9	S04E07	8.3	378	Little Green Men
DS9	S04E10	8.1	302	Homefront
DS9	S04E22	8	285	To the Death
DS9	S04E25	8.1	286	Broken Link
DS9	S05E01	8.1	293	Apocalypse Rising
DS9	S05E02	8	277	The Ship
DS9	S05E06	8.4	621	Trials and Tribble-ations
DS9	S05E14	8.5	312	In Purgatory's Shadow
DS9	S05E15	8.5	310	By Inferno's Light
DS9	S05E26	8.6	337	Call to Arms
DS9	S06E01	8.4	300	A Time to Stand
DS9	S06E02	8.6	306	Rocks and Shoals
DS9	S06E05	8.4	288	Favor the Bold
DS9	S06E06	8.6	341	Sacrifice of Angels
DS9	S06E13	8.5	541	Far Beyond the Stars
DS9	S06E18	8.1	283	Inquisition
DS9	S06E19	8.3	657	In the Pale Moonlight
DS9	S06E26	8.1	268	Tears of the Prophets
DS9	S07E06	8.1	248	Treachery, Faith, and the Great River
DS9	S07E08	8.4	334	The Siege of AR-558
DS9	S07E16	8.1	276	Inter Arma Enim Silent Leges
DS9	S07E20	8.4	245	The Changing Face of Evil
DS9	S07E21	8.1	234	When It Rains...
DS9	S07E22	8.5	249	Tacking Into the Wind
DS9	S07E24	8.2	257	The Dogs of War
DS9	S07E25	8.4	438	What You Leave Behind
VOY	S01E06	8.1	350	Eye of the Needle
VOY	S02E18	8.2	330	Death Wish
VOY	S02E21	8.1	299	Deadlock
VOY	S03E08	8.2	340	Future's End: Part 1
VOY	S03E09	8.1	311	Future's End: Part 2
VOY	S03E21	8	264	Before and After
VOY	S03E23	8.3	310	Distant Origin
VOY	S03E25	8	260	Worst Case Scenario
VOY	S03E26	8.3	397	Scorpion: Part 1
VOY	S04E01	8.6	370	Scorpion: Part 2
VOY	S04E08	8.5	357	Year of Hell: Part 1
VOY	S04E09	8.3	328	Year of Hell: Part 2
VOY	S04E14	8.6	360	Message in a Bottle
VOY	S04E16	8.1	246	Prey
VOY	S04E23	8.6	339	Living Witness
VOY	S04E25	8	270	One
VOY	S04E26	8	254	Hope and Fear
VOY	S05E02	8.3	345	Drone
VOY	S05E06	8.5	357	Timeless
VOY	S05E11	8.1	299	Latent Image
VOY	S05E15	8.2	290	Dark Frontier: Part 1
VOY	S05E16	8.2	270	Dark Frontier: Part 2
VOY	S05E22	8.1	284	Someone to Watch Over Me
VOY	S05E24	8.4	292	Relativity
VOY	S05E26	8.3	279	Equinox: Part 1
VOY	S06E01	8	292	Equinox: Part 2
VOY	S06E04	8.3	319	Tinker Tenor Doctor Spy
VOY	S06E10	8.2	283	Pathfinder
VOY	S06E12	8.6	394	Blink of an Eye
VOY	S06E24	8.2	256	Life Line
VOY	S06E26	8	242	Unimatrix Zero: Part 1
VOY	S07E25	8.3	540	Endgame
ENT	S01E26	8.5	236	Shockwave: Part 1
ENT	S02E01	8.5	656	Shockwave: Part 2
ENT	S02E22	8.3	256	Cogenitor
ENT	S02E23	8.4	726	Regeneration
ENT	S03E08	8.6	310	Twilight
ENT	S03E13	8.4	211	Proving Ground
ENT	S03E18	8.6	229	Azati Prime
ENT	S03E19	8.5	203	Damage
ENT	S03E22	8.6	197	The Council
ENT	S03E23	8.7	204	Countdown
ENT	S03E24	8.7	223	Zero Hour
ENT	S04E04	8.5	218	Borderland
ENT	S04E05	8.5	208	Cold Station 12
ENT	S04E06	8.6	212	The Augments
ENT	S04E07	8.7	202	The Forge
ENT	S04E08	8.6	195	Awakening
ENT	S04E09	8.6	203	Kir'Shara
ENT	S04E12	8.7	204	Babel One
ENT	S04E13	8.6	190	United
ENT	S04E14	8.6	195	The Aenar
ENT	S04E16	8.4	190	Divergence
ENT	S04E18	8.7	360	In a Mirror, Darkly: Part 1
ENT	S04E19	8.7	327	In a Mirror, Darkly: Part 2
ENT	S04E21	8.4	227	Terra Prime