I'd have to say "Tempests".
The ending is depressing but you really never saw it coming.

"Music of the Spheres" hands down (season 3 episode 14)
Mike: She is not gonna take off her top for beads
Chau: Son, it aint called Girls Gone Bashful

I THINK THE BEST EPISODE IS THE NEW BREED WITH THE NANOBOTS THAT IS WICKED OTHER GREAT ONES ARE TRIBUNAL,FIRST ANNIVERSARY,BREAKING POINT,THE GUN,THE HUNT,AND THE SENTENCE! AWESOME!

The Light Brigade was excellent, I agree.

"Vanishing Act", I remember it still though I only saw it once, 9 years ago. I've spent the last hour going through the episodes (on the net) and the next step is to decide where to buy the first two seasons.
"Inconsistent Moon" is another episode that stuck to my mind. AND the episode with Harlan "I won't die" Hawkes!
'Non scholae sed vitae discimus.'

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The one episode that I like, is the episode "Caught in the Act" with Alyssa Milano.

@ junmengo: I just watched "Human Operator," and I agree that it was an outstanding episode.
Jack Noseworthy as the Male Operator was pretty hot himself.
The premise was simple but the outcome was empowering. Great!

Definitely has to be "A Stitch in Time" with Michelle Forbes and Amanda Plummer.

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Human operators by far, beautiful beautiful and beautiful, the actors was great, the plot was pretty simple but touching, could give a great movie and the actress polly shanon it's terrific hot

I"ve got that on VHS taped from the TV about 6 years ago.The b*****ds who run the BBC used to stick the NOL on if the cricket finished early,so you never knew exactly which episode would be shown or when!Great story,great twist.

Just found out it's "The New Breed"- or something like that.
"I can resist anything, except temptation"

Don't know the name of it, but the one with the "nanobots" is fantastic! I've only seen it once, and I don't know if I'd want to see it again (the eyes in the back of the head thing still freaks me out!)- but I loved it!
"I can resist anything, except temptation"

The one with the freaky boarding school that turned kids into mindless slaves was good.
I saw the one the other night, 'The Stream' I think it was called (even if it's the wrong name I think you'll know which one that is) and it was the first OL episode in ALOT that I've seen that had a happy ending! I didn't know they existed in this show!

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Its probably not my Favorite but I really liked the one where the moon was glowing like crazy or something.
"Cool will get ya dead." -Former NBA Power Forward, Karl Malone

To Tell the Truth was the title, it was a good one. My favorite is Zig Zag, Frank Whaley was awesome in it, so was Leslie Hope.

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I forgot a good one I just saw, it was set on a colony, but in the end the colonies gets destoryed and reinhabited by the very same aliens who were walking amoungts the human in the first place.
Anyone know it?

I believe the episode your'e referring to is called 'The Human Operators'
My favourite episodes, too many to mention.
But off the top of my head:
Sandkings
Valerie 23
Mary 25
If these walls could talk
Quality of mercy
The voice of reason
Bits of love
Resurrection
The deprogammers

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Probably ;3rd Feasibility Study-Great story,great twist and great scene where the aliens yank the housing estate into the sky.2nd The Light Brigade-Practically a mini movie with great SFX and Robert Patrick on top form as the evil Skokes.1st A Stitch In Time-best Time travel story ever {IMO} and Amanda Plummer superb as Dr Givens.The scene where the Time travel room dematerialises is excellent!