The name "Mothra" is the suffixation of "-ra" (a common last syllable in kaiju names) to "moth." Since the Japanese language does not have dental fricatives, it is approximated "Mosura" in Japanese.
The twin Mothra larvae in Godzilla: Tokyo SOS were each given their own unique nicknames by the production crew. The male larva is called Taro (太郎 Tarō), while the female is called Hanako (花子 Hanako).[2][3] In an episode of the children's variety show Oha Suta promoting Godzilla: Tokyo SOS, the male and female larvae were instead referred to as Mosu (モス Mosu) and Lara (ララ Rara), respectively.
Godzilla: Tokyo SOS (ゴジラ×モスラ×メカゴジラ 東京SOS Gojira Mosura Mekagojira: Tokyo Esu Ō Esu, lit. "Godzilla × Mothra × Mechagodzilla: Tokyo SOS") is a 2003 tokusatsu kaiju film directed by Masaaki Tezuka and written by Tezuka with Masahiro Yokotani, with special effects by Eiichi Asada. Produced by Toho Pictures, it is the 27th mainline installment in the Godzilla series and the 28th Godzilla film overall, as well as the fifth in the Millennium series. It stars Noburo Kaneko, Miho Yoshioka, Mitsuki Koga, Chihiro Otsuka, Masami Nagasawa, Tatsuki Omori, Koichi Ueda, Yumiko Shaku, Akira Nakao, and Hiroshi Koizumi. The film was released to Japanese theaters by Toho on December 13, 2003.[2] Columbia TriStar Home Video released the film on DVD in the United States in 2004.
A direct sequel to Godzilla Against Mechagodzilla, Tokyo SOS is the only entry in the Millennium series to be a sequel to a prior film in that series. In 2004, one year after Kiryu's battle against Godzilla, the Shobijin appear to request that the first Godzilla's bones be returned to the ocean, as their use in Kiryu violates the natural order. The government is hesitant to scrap the project lest Godzilla return, which comes to pass as the King of the Monsters makes landfall in Tokyo once more. Mothra arrives to intercept him, and the government is left with no choice but to launch Kiryu into the battle as well.
Tokyo SOS was followed by the final Millennium Godzilla film, Godzilla Final Wars, in 2004.