Farewell, Ultraman (E39)

More than four decades of unsolved flying saucer sightings are revealed to have been advance scouts of the Alien Zetton race. After destroying all orbital satellites, the Zetton mother ship and her escorts advance on Japan. The day seems lost until the real Professor Iwamoto reappears. Ultraman's time on Earth has come to an end. The Earth, for now, is safe. (Prime Video)