April 29, 1964 –

The Toho Studios released their first cross-over monster movie Mosura tai Gojira (Godzilla vs. the Thing (Mothra)) in Japan on this date. This is the first Godzilla film without newly-shot American footage added for the American release.
1964 was the only year when Toho released two Godzilla movies in the same year. Right after this film, Toho began working on Ghidorah, the Three-Headed Monster, which premiered that December.
