This is just my opinion of course, UFO is a very strong series, my third favourite behind Classic Who and Blake's 7, the episodes I've ranked in the bottom 4 are IMO easily the worst, the top five easily the best, and the others all good stuff. So here goes.
26. Close Up
This is my least favourite, in fact it's awful.
A boring pointless story about SHADO trying to get photos of the alien's home planet. Why this should be a game changer is not gone into. A super new camera is constructed and placed in a space vehicle in orbit around the moon, then a UFO is lured to veer away from the moon and return home. The SHADO craft follows, but as it is travelling at sub light speed it can't possibly keep up, but somehow does, then the camera develops a fault, so it's all a waste of time anyway. The main plot action, latching on to the UFO doesn't happen till about 35 minutes in, before that we had the most tedious space walking scene imaginable zzzzzzz.

25. Confetti Check AO-K
An episode that for me doesn't have much rewatch value, though I can see why fans could be dead keen on this, it just isn't for me. The whole episode is a flashback , to when SHADO was formed, we see the appointment of Straker as Commander, the early days of Alec Freeman and the Moonbase dolly girls, the construction of the SHADO HQ all played out to the disintegration of Straker’s marriage. Sort of interesting to see......once, but no alien attacks or any Sci Fi trappings.

24. Ordeal
Now this episode has a lot of promise, and has a very memorable scene.
Paul Foster is kidnapped by aliens whist in a health farm. He is put on board a UFO, and ends up in an alien spacesuit breathing green liquid. Really good, and when Straker orders the escaping UFO should be blasted out of the sky even though Foster is on board, more excitement. Unfortunately as the whole thing is a dream Foster is having in the sauna, who cares?!

26. Close Up
This is my least favourite, in fact it's awful.
A boring pointless story about SHADO trying to get photos of the alien's home planet. Why this should be a game changer is not gone into. A super new camera is constructed and placed in a space vehicle in orbit around the moon, then a UFO is lured to veer away from the moon and return home. The SHADO craft follows, but as it is travelling at sub light speed it can't possibly keep up, but somehow does, then the camera develops a fault, so it's all a waste of time anyway. The main plot action, latching on to the UFO doesn't happen till about 35 minutes in, before that we had the most tedious space walking scene imaginable zzzzzzz.

25. Confetti Check AO-K
An episode that for me doesn't have much rewatch value, though I can see why fans could be dead keen on this, it just isn't for me. The whole episode is a flashback , to when SHADO was formed, we see the appointment of Straker as Commander, the early days of Alec Freeman and the Moonbase dolly girls, the construction of the SHADO HQ all played out to the disintegration of Straker’s marriage. Sort of interesting to see......once, but no alien attacks or any Sci Fi trappings.

24. Ordeal
Now this episode has a lot of promise, and has a very memorable scene.
Paul Foster is kidnapped by aliens whist in a health farm. He is put on board a UFO, and ends up in an alien spacesuit breathing green liquid. Really good, and when Straker orders the escaping UFO should be blasted out of the sky even though Foster is on board, more excitement. Unfortunately as the whole thing is a dream Foster is having in the sauna, who cares?!
