Ghidorah, the Three-Headed Monster (1964)

A meteor lands in Kurobe Valley as detective Shindo is assigned to protect Princess Salno from assassination. She emerges under the guise of a Venusian prophetess and catches the attention of journalist Naoko and Mothra's fairies by predicting a powerful space monster's arrival. The infant Mothra must convince Godzilla and Rodan to set aside their hatred of humanity or face the monster alone.