Robotech: The Movie, also called Robotech: The Untold Story, is a 1986 American-Japanese science fiction animated film based on the Robotech TV series and Robotech franchise created by Harmony Gold USA. The film was created by splicing together footage from the Japanese direct-to-video movie Megazone 23 Part I and animated television series Super Dimension Cavalry Southern Cross, and had only a loose connection to the Robotech TV show.

Plot

In the year 1999, the alien spacecraft SDF-1 crashed on Earth, followed ten years later by the alien Zentraedi, seeking to reclaim the vessel for their rulers, the Robotech Masters. The First Robotech War erupted over the vessel, ending with victory for humankind, at the cost of the SDF-1 itself. Now, in 2027, the Robotech Masters themselves arrive in Earth's Solar System, aiming to recover the ship's still-functional mother computer, being studied at Earth's Robotech Research Center in Japan. The Masters launch a covert attack on a small human settlement, killing Colonel B.D. Andrews of the Army of the Southern Cross and secretly replacing him with a clone. Following a disastrous attack by the ASC on the Masters’ flagship, the Andrews clone proposes that the military take charge of use the mother computer to formulate a defense against the Masters. When his proposal is approved, he secretly begins beaming the contents of the computer's database to the Masters, after which they plan to destroy the Earth.