Favourite Episodes from each Series

[Belz...]

TOS: The Cage (does this count ? If not, The Doomsday Machine)
TNG: Yesterday's Enterprise
DS9: The Way of the Warrior
VOY: Caretaker (seriously, that was a pretty good episode)
ENT: Not sure. I have to watch it a second time, first.

Movies: TWOK

 

[Third Nacelle]

TOS: The City on the Edge of Forever
TNG: tie between First Contact and The Inner Light
DS9: Call to Arms (or the whole occupation arc if you can count that as an episode)
VOY: Year of Hell
ENT: Carbon Creek

Of course this all changes depending on my mood.

 

[GameOn]

TOS: The City on the Edge of Forever
TAS: Yesteryear
TNG: The Best of Both Worlds and Yesterdays Enterprise
DS9: In the Pale Moonlight and The Visitor
VOY: Living Witness and Timeless
ENT: Twilight

 

[Orac]

These are my favourites today, however like Third Nacelle these change frequently depending on my mood.

TOS: Errand of Mercy
TAS: Beyond the Farthest Star
TNG: The Defector
DS9: The Visitor
VOY: Blink of an Eye
ENT: Cogenitor

 

[JirinPanthosa]

TOS: The Corbomite Maneuver
TNG: Tapestry
DS9: The Visitor
Voy: Blink Of An Eye
Ent: Similitude

 

[BillJ]

TOS: A Taste of Armageddon
TNG: Where No One Has Gone Before
DS9: In the Pale Moonlight
VOY: The Thaw
ENT: Strange New World

Movies: The Motion Picture

 

[Belz...]

Movies: The Motion Picture

Interesting.

 

[LOKAI of CHERON]

Movies: The Motion Picture

Interesting.

Belz..., there's a lot more love for TMP than some of the very vocal detractors within Trek fandom may have you believe. Yep, chalk me up as another who rates it at the top.

As for the shows, definitively declaring absolute favourites is waaay too difficult a task for me. There's just so many, and the "leader board" is in a constant state of metamorphosis!

 

[Belz...]

I'm a huge fan of TMP, myself. It's my second-favourite Trek movie and one of my all-time favourite sci-fi movies.

 

[CorporalClegg]

"Balance of Terror"
"The Offspring"
"Duet"
"Deadlock"
"Shuttlepod One"

 

[CorporalCaptain]

The Doomsday Machine
Yesteryear
The Offspring
Far Beyond the Stars
Real Life
Horizon
The Wrath of Khan

The post-TOS favorites fluctuate, so this is just what they are today. TDM has been my favorite TOS episode for decades; City is second place. TWOK has been my favorite Trek film since I saw it. As for ENT, I went with Horizon, rather than In a Mirror, Darkly, because Horizon is my favorite Prime Universe episode of ENT; it's really IAMD for ENT, though.

 

[R. Star]

TOS: Balance of Terror
TNG: Tapestry
DS9: Duet
VOY: Living Witness
ENT: Borderland/Cold Station 12/The Augments

 

[Portal]

"Data's Day" TNG