 In the original Japanese version, the aliens are called  "Mysterians." When he visited the United States, special effects  director Eiji Tsuburaya  (qv) was surprised to discover that the  term "Mysterians" was well known. It had also been used in the  English dubbing, and the film had even been released in the United  States under the title _The Mysterians (1957)_ (qv).