I like the opening music, but the ending is slightly strange. It seems to me the Aliens win by knocking out SID.

I vaguely remember this; it was the movie that felt like some episodes had been compiled together, right? At least that's the impression I got watching it as a youngster. (It's been even longer since I've seen an actual episode, but I do still have my ViewMaster reels!) Could you at least confirm for me that there was a scene involving a seagoing ship that met a fiery demise thanks to a UFO? I think it was about halfway through the film, but again, my recollections are vague. I do remember that after SID gets knocked out, the film just ENDS right after that point.

Its Identified, leading into Computer Affair, then a clip from ESP of Foster returning to SHADO leads into Reflections in the Water (with the ship being sunk) and the end battle, and the film, concludes with SID being hit. We hear Straker's thoughts from the end of the first ep over the end credits space shots, and the end theme music is played twice over this.

All 6 eps involved are massively cut, to get the whole thing down to 95 minutes ish. In particular, the whole Ellis/Bradley thing from Computer Affair is missing.

Whoopsie, forgot to mention the clip from CONFETTI CHECK A-OK as Straker goes to see the delegates. This is seen after the car crash, and once Henderson tells Straker he's the CinC, there's a cut to Identified, as Freeman enters SHADO HQ, with the caption TEN YEARS LATER added.

A very dumb idea to make a movie by snipping episodes together. I absolutely hated this movie, because I had so enjoyed the episodes that it was chopping to bits! There were several episode strings that could have been put together to make an interesting movie without any snipping necessary, and it makes me wonder if whoever did this mess even liked the show!

I haven’t seen this movie but if they used the part of Reflections with the battle against the massive fleet of UFOs why didn't they put that in last?
It would have made sense; it would seem like a final attack.

Perhaps what the people who stitched this movie together might have said about its abrupt ending is that in the war such as is depicted in the TV series/this movie, there are going to be casualties, and they decided to end it on something of a downbeat note.

In actuality, apparently it was rushed in order to meet a deadline, and time ran out before they could tidy it up.

For a "movie" spliced together from various unrelated bits it actually works quite well. No, its no classic, but its reasonably coherent.

It's reasonably coherent if you ignore some characters disappearing two-thirds of the way in and one or two more appearing fron nowhere - for example, a scene from ESP is included as a bridging scene, where George Sewell makes his last appearance in the "movie" and Michael Billington his first.

Also, at the end of the "movie", the Skydiver crew have changed. The scene where Sky 1 is launched to deal with a wave of UFOs looks rushed in comparison to the footage from "Identified" in the first 30 minutes of this "movie". Every time I see it I keep expecting the director to shout "Cut! Let's take it again!" I'm referring to the bit of business with the Captain forgetting his helmet and the lack of Launch Stations procedure detailed earlier in the "movie".

Some new music was added to the battle sequence at the end. I think it works well. The music was very familiar to me because it was also used in some educational films I saw in school. ITC used some music for the "Super Space Theater" films (compilations of ITC tv episodes) that was already used in other productions.
The editing wasn't the best for sure.
This film did leave a nice little UFO momento: a nice bit of artwork for the box cover. It sure makes "Invasion:UFO" look exciting. I think NBC also used a similar title when it showed "Hangar 18" (flying saucer flick) on tv, "Invasion:Earth".

I managed to identify at least four episodes when I saw it. Confetti-Check A-OK for when Straker makes the case to the UN to appropriate funds for SHADO. Identified for when they try to make the first interception and grab an alien. The Computer Affair for the attempted acquisition in northern Canada. Reflections in the Water for the dome (they cut it so that Straker and Foster take one outing in the sea - they omit Straker and Foster seeing one of their own people inside, return to SHADO, see him, question him, and then return to the sea to try getting inside), and the mass attack. I wonder why the aliens use cassette tape recorders? The Man Who Came Back for the shot of SID being hit.

Someday, perhaps, I'll purchase the DVD set. It is rather pricey.

The DVD set is a joy. Picture quality is superb and the audio commentaries are highly enjoyable. The best part about UFO is that it's a show written for an adult audience. It is even more enjoyable watching this show as an adult than as a kid. The retro-future depicted has a funky nostalgic appeal too!

I saw this myself, decades ago.

At the time, I didn't know that it was a TV series (the movie was some episodes slapped together).