If I only had one (and only ONE!) epp too watch it would be...

[Stella's_Funboy]

'By Any Other Name'

 

[BillJ]

The Omega Glory

 

[Stella's_Funboy]

'By Any Other Name'

And so did I, just now.

Ahhh, the wonders of Netflix. Best $7.95 I've ever spent.

 

[NTRPRZ]

"The Doomsday Machine"
Absolutely the best.

 

[WisTrekFan]

Doomsday Machine.

 

[KeepOnTrekking]

"The Doomsday Machine"

 

[RandyS]

Mirror, Mirror.

 

[Orac]

The Corbomite Maneuver.

 

[jayrath]

The Corbomite Manuever.

 

[Admiral Buzzkill]

City On The Edge Of Forever.

 

[AtoZ]

City on the Edge of Forever

 

[Valin]

It depends on the mood I'm in. Today, I'd say "The Conscience of the King."

 

[Scrambo]

Balance of terror

 

[Joanna McCoy-Kirk]

"The Menagerie"

 

[Gojira]

Tomorrow is Yesterday.

 

[A.V.I.A.F.]

The Enterprise Incident.

 

[Biffette]

The Deadly Years

 

[WillsBabe]

The Deadly Years

ditto. I love that episode. I still have the original Photonovel (and sometimes look at that rather than watching the ep. I know, I know... )

 

[spot_loves_data]

Balance of terror

Same here, Mark Lenard was perfect in this one.

 

[smalltalk66]

Damn, this is hard. So many choices.
I'd have to say "This Side of Paradise."
Spock's last thought, "For a moment...I was happy." That line always gets me.