Kiryu is undergoing repair modifications after its battle with Godzilla. Prime Minister Hayato Igarashi accepts Lead Scientist Yoshito Chujo's choice to replace the Absolute Zero Cannon with a powerful Tri-Maser.
The Shobijin (Mothra's twin fairies) warn the Japanese government that Godzilla continues returning to Japan because they used the original Godzilla's bones in Kiryu's design. If they return the bones to the bottom of the sea, Mothra would gladly take Kiryu's place in defending Japan, but if they do not, Mothra will declare war on humanity. Soon enough, Kamoebas, a giant mata mata turtle, is found washed ashore on a Japanese beach. It is determined by the wounds on Kamoebas' neck that Godzilla killed it. Godzilla and Mothra fight, but Godzilla seems to have the upper hand. With the repairs finished just in time, Kiryu manages to even the odds, but Godzilla still manages to knock it and Mothra out.
Meanwhile, on Infant Island, two twin Mothra larvae hatch from Mothra's egg, and rush to help their mother. As Kiryu undergoes repairs again, the larvae try to hold Godzilla off, but Mothra sacrifices herself by flying in the way of Godzilla's atomic breath, saving the larvae. Just in time, Yoshito and the humans repair Kiryu, who stabs Godzilla's chest with a drill, causing Godzilla to bleed and roar in pain. The larvae begin to bind Godzilla up in silk. Just as Kiryu's pilot, Azusa Kisaragi, receives the order by Igarashi to destroy Godzilla before the Kiryu project is scrapped, Kiryu's soul is reawakened through Godzilla's roar. The cyborg lifts Godzilla and secures its grip with cables. Kiryu then uses its boosters to carry itself and Godzilla to the bottom of the ocean.
In the film's post-credits scene, in an undisclosed location, a laboratory is shown, filled with canisters that contain the DNA of numerous Toho kaiju. It is stated in the Japanese version via a narrator announcing that a "bio-formation" experiment involving an "extinct subject" is about to take place, implying that the JXSDF plans to create another mecha or kaiju-based superweapon, which could mean that Godzilla or another monster could appear once again. In the Japanese version, Godzilla and Kiryu are seen one more time, roaring as they descend into the ocean.Noboru Kaneko as Yoshito Chujo
Miho Yoshioka as JXSDF Lt. Azusa Kisaragi
Mitsuki Koga as Kiryu Operator Kyosuke Akiba
Masami Nagasawa and Chihiro Otsuka as the Shobijin
Hiroshi Koizumi as Dr. Shinichi Chujo
Yumiko Shaku as JXSDF First Lt. Akane Yashiro
Koh Takasugi as JXSDF Colonel Togashi
Kenta Suga as Shun Chujo
Akira Nakao as Prime Minister Hayato Igarashi
Koichi Ueda as General Dobashi
Naomasa Rokudaira as Goro Kanno
Yūsuke Tomoi as Susumu Hayama aka Lieutenant Hayama
Tsutomu Kitagawa as Godzilla
Motokuni Nakagawa as Kiryu
Toho had commissioned four story outlines for director Tezuka to choose from. Tezuka found them all boring, so instead he wrote a new story outline overnight and submitted it to the studio, which eventually approved.
Godzilla: Tokyo SOS opened on 14 December 2003 on a double bill with the animated feature Hamtaro: Ham Ham Grand Prix. In its opening weekend, it was third place at the box office with $1,686,009 (U.S).
Godzilla: Tokyo S.O.S. has received generally positive reviews from journalistic reviewers upon its release on DVD. John Sinnott of DVD Talk gave Tokyo SOS four stars out of five, saying:
Giving the film a score of three out of five, Stomp Tokyo said "the plot is fairly simplistic and the character relationships are painted in broad strokes," but added that the movie "[features] the best monster action Toho has produced." Joseph Savitski of Beyond Hollywood criticized the film's "uninspired script," which he wrote had "ideas [that] are never fully developed," but added that the film is "well-made" and "mak[es] for an entertaining 91 minutes." Mark Zimmer of Digitally Obsessed gave Tokyo S.O.S. a "B" score, calling it "a fun enough action film with enough explosions and destruction of Tokyo to satisfy die-hards and casual fans alike."
Sony - Blu-ray (Toho Godzilla Collection) Released: 6 May 2014
Picture: 2.35:1 (MPEG-4 AVC) [1080P]
Sound: Japanese and English (DTS-HD Master Audio 5.1)
Subtitles: English, English SDH, and French
The Making of Godzilla: Tokyo S.O.S. (SD, Japanese DD 2.0, English subtitles, 21:48)
Theatrical Trailer (HD, Japanese DD 2.0, English subtitles, 0:35)
Notes: This is a 2-Disc double feature with Godzilla: Final Wars.
Columbia/Tristar Home Entertainment - 50th Anniversary Released: 14 December 2004
Aspect Ratio: Anamorphic Widescreen (2.35:1) [NTSC]
Sound: Japanese and English (Dolby Digital 5.1)
Making Of - Featurette [Special Effects] (21:47)
Japanese Teaser Trailer
Preview Trailers: Steamboy, Kaena: The Prophecy and Anacondas: The Hunt for the Blood Orchid
Case type: Keep Case
Notes: Also available in a 3-Disc "50th Anniversary Godzilla DVD Collection" box set; along with Son Of Godzilla  and Godzilla vs. Mechagodzilla .