Be Forever Yamato , Yamato yo Towa ni? is a 1980 Japanese science fiction anime film and the third theatrical film based on the classic anime series Space Battleship Yamato known as Star Blazers in the United States. The film is unique for switching from monaural VistaVision 11.85 to Quadraphonic CinemaScope 12.35 when the Yamato enters the Double Galaxy.
The Yamato reaches the other side of the Black Nebula and finds a grand, white galaxy, similar to the Milky Way. They follow a beacon signal to a planet that looks just like Earth. They land, and are greeted by an apparently human woman, Sada, and two officers from the Black Nebulan Empire. They meet the Emperor, Scaldart, who also appears to be a human. He tells them that they are actually back in the Milky Way, in the year 2402. The vortex was a hole in time. The Earth has been under Black Nebulan rule for 200 years, and he is the puppet governor. Scaldart shows Kodai and the landing party all sorts of collections of Earths famous artwork, and, up on the Yamato, the video screen scans the surface of the planet to find all of Earths famous landmarks.Scaldart shows them a time viewing machine which shows the history of the Yamato from 2199 up until the present. Then he shows them the future. The Yamato, orbitting the Earth, is destroyed by the enemys flagship, the Grodaze, in 2402. ........
Source: Wikipedia