INVASION: UFO is a 90 minute movie created by compiling scenes from several episodes of UFO. It is not the pilot movie for the series, and in fact was produced ten years after UFO was made! The episodes used for the compilation are IDENTIFIED (32 mins), COMPUTER AFFAIR (25 mins), REFLECTIONS IN THE WATER (27 mins), CONFETTI CHECK A-OK (5 min), THE MAN WHO CAME BACK (1 min), and ESP (less than 1 min). A new title sequence was created, and additional music was added or overlayed onto the existing music. There are some fans who find this compilation movie enjoyable, while others think it is vastly inferior to the original episodes. Oddly enough, in the 1980s and 1990s INVASION: UFO was broadcast more frequently than the original series in many areas, and in the UK five of the original UFO episodes used to make the movie were never released on Polygram's VHS videos because the movie had exclusive video rights!
Although INVASION: UFO was the only English-language UFO compilation movie, there were 5 dubbed Italian UFO compilation movies which were released in Italian theaters in the early 1970's. The Italian movies were released on VHS in the past, and are being released on DVD in 2005.