War of the Planets in order

Cosmos: War of the Planets was released in 1977 and grossed a total of 123,200,000 Italian lire domestically in Italy. Recycling the film's actors, costumes, sets, and props, Brescia produced four loosely-connected sequels: Battle of the Stars, War of the Robots, Star Odyssey, and the adult film-inflected, The Beast in Space. 5 films, 7h 52m in all, in release order.

War of the Planets
1977 · 89 min
A strange signal arrives on the Earth disturbing all communications, while an UFO appears above the Antarctic sea. Captain Alex Hamilton is sent with his spaceship and crew to the space outside the Solar System to find the origin of that signal. They reach an unknown planet where a giant robot enslaved a whole population of humanoids by taking their psychic energies.
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Battle of the Stars
1978 · 95 min
An alien vessel manages to break the earth defense systems. Captain Layton is sent to investigate and find the invaders. Together with friends from the planet Ganymed he discovers the enemies in a hidden underground city on earth.
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The War of the Robots
1978 · 99 min
An alien civilization, which facing eminent extinction, kidnaps two famous genetic scientists from Earth. A troop of soldiers is dispatched to combat the humanoid robots and rescue the victims.
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Star Odyssey
1979 · 103 min
Earth is attacked by an intergalactic villain and his army of robotic androids.
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Beast in Space
1980 · 86 min
In the future the struggle for space superiority has forced humanity to search the cosmos for a rare element called Antallum that is the key ingredient for the construction of neutron bombs. Starship captain Larry Madison and his crew are assigned to retrieve Antallum from the remote planet Lorigon. However, Madison and crew find themselves under the control of a powerful computer on Lorigon that incites everyone to have sex. Some versions feature brief adult scenes shot with body doubles.
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Frequently asked questions

What order should I watch War of the Planets in?

1. War of the Planets (1977), 2. Battle of the Stars (1978), 3. The War of the Robots (1978), 4. Star Odyssey (1979), 5. Beast in Space (1980).

How long does it take to watch all of War of the Planets?

About 7h 52m across 5 released films.

Do any War of the Planets films have post-credit scenes?

None are listed on TMDB.