You can find Godzilla: Tokyo S.O.S. (2003) on the Internet Archive
(2003), preserving various versions of the film and related media that can be difficult to find through traditional streaming. Available Content on Internet Archive godzilla tokyo sos internet archive
The story opens with the Shobijin warning the Japanese government that the construction of Kiryu (Mechagodzilla) has disturbed the spirit of the original Godzilla. They demand the machine be dismantled. Before the government can decide, a new, adult Godzilla emerges from the ocean. You can find Godzilla: Tokyo S
If you search "Godzilla Tokyo SOS Internet Archive" and find that the links have been removed due to copyright claims, do not despair. Here are legal alternatives where you can stream or buy the film: The Japanese "Theatrical Cut" with specific color grading
Released in 2003, Godzilla: Tokyo S.O.S. (ゴジラ×モスラ×メカゴジラ 東京SOS) stands as a pivotal entry in the Millennium series, often hailed for its blend of traditional suit-mation and early 2000s special effects. As the direct sequel to Godzilla Against Mechagodzilla (2002), it forms the "Kiryu Saga," the only truly connected narrative arc within the otherwise anthology-style Millennium era.
: A direct search for Toho-related content on the archive often yields the English dubbed version of the film for free streaming or borrowing. Movie Context Continuity : It is a direct sequel to Godzilla Against Mechagodzilla