UFO in order

6 films, 9h 9m in all, in release order.

UFO: Destroy Luna Base!
1971 · 90 min
Moonbase Luna represents Earth's first Defence bulwark against the extraterrestrial threat, and is therefore one of the primary targets in attacks by UFOs. At the command of the fascinating Lieutenant Ellis, Base Luna is one of the most sophisticated facilities in SHADO, the secret organisation tasked with defending Earth from alien incursions.
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UFO: Red alert... Attack on Earth!
1971 · 83 min
Few people know of the chilling reality behind the mysterious phenomenon of unidentified flying objects. Beings from a dying planet have arrived on Earth to kidnap humans and take over their vital organs. Against this threat, SHADO has been created, a secret organisation equipped with the most advanced technology and the best men.
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UFO: Annihilate SHADO... Kill Straker...
1972 · 86 min
In 1980, the Supreme Headquarters Alien Defence Organisation (S.H.A.D.O.) is formed to protect Earth from an alien race that kidnaps humans and animals for their body parts. Operating from a secret base beneath a London film studio.
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UFO: Take Them Alive
1972 · 98 min
SHADO receive a report that a former Olympic champion has disappeared from a farm in the English countryside, thinking it might be an alien abduction, Colonel Paul Foster is dispatched to track down the UFO and eliminate it.
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UFO: Radar contact... They're landing!
1974 · 95 min
Fleets of UFOs roam around the Moon Base. One manages to land and is confronted by Colonel Foster who is then accused of treason for having collaborated with the alien pilot in an attempt to survive on the lunar surface. Foster flees, chased by security agents, while Commander Straker and Colonel Freeman investigate to exonerate him.
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Invasion: UFO
1980 · 97 min
The Earth is threatened by an alien race who kidnap and kill humans and even animals and use them for their body parts. In the year 1980 S.H.A.D.O. (Supreme Headquarters Alien Defence Organization), a highly secret military organization, is set up in the hope of defending the Earth from this alien threat. This organization operates from a secret location beneath the Harlington-Straker film studio in London. S.H.A.D.O. also has a base on the moon with Interceptors as well as an early warning satellite that detects inbound UFOs (called S.I.D.), and operate a fleet of submarines. General James Henderson and commander Ed Straker have a team of highly trained and well equipped females and males to battle the regularly incoming hostile UFOs.
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Frequently asked questions

What order should I watch UFO in?

1. UFO: Destroy Luna Base! (1971), 2. UFO: Red alert... Attack on Earth! (1971), 3. UFO: Annihilate SHADO... Kill Straker... (1972), 4. UFO: Take Them Alive (1972), 5. UFO: Radar contact... They're landing! (1974), 6. Invasion: UFO (1980).

How long does it take to watch all of UFO?

About 9h 9m across 6 released films.

Do any UFO films have post-credit scenes?

None are listed on TMDB.