Enterprise season three, "Twilight".
The only good episode that year.
I've just finished watching "Twilight" for the first time and sort of enjoyed it, even though it seemed to be a mixture of "The Visitor", "Yesterday's Enterprise" and "All Good Things..."
I had a similar reaction the first time I saw it when it aired, and you have to admit it's in good company. Yesterday's Enterprise is my most favorite TNG episode, as a matter of fact.
For me today: TAS episode Yesteryear.