The Millennium series (ミレニアムシリーズ, also known as the New Century Series Mireniamu Shirīzu) (新世紀シリーズ, Shinseki Shirīzu) is a term used to identify the films in the Godzilla series released from 1999 to 2004. It is notable for the fact that most of its movies do not follow a set timeline or occur in the same continuity (except for Godzilla Against Mechagodzilla and Godzilla: Tokyo S.O.S.).
Following the close of the Heisei series of Godzilla films in 1995 with Godzilla vs. Destoroyah, Toho originally intended to wait approximately ten years before producing its next Godzilla film, allowing TriStar Pictures to produce a trilogy of American-made Godzilla films in the meantime. When TriStar's GODZILLA was released in 1998 to widespread fan disappointment and backlash, Toho saw an opportunity to bring their series out of retirement early. Toho produced the first Millennium Godzilla film, Godzilla 2000: Millennium, in 1999, and went on to produce a total of six films in the series. Following Godzilla's 50th anniversary film, Godzilla: Final Wars, in 2004, Toho decided to retire the series for another decade in order to renew interest. While an American Godzilla film would be produced by Legendary Pictures in 2014, Toho would not produce another Godzilla film until Shin Godzilla in 2016.
- Godzilla 2000: Millennium (1999)
- Godzilla vs. Megaguirus (2000)
- Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack (2001)
- Godzilla Against Mechagodzilla (2002)
- Godzilla: Tokyo S.O.S. (2003)
- Godzilla: Final Wars (2004)
Despite being released in 2006 and not sharing continuity with the Gamera trilogy, Gamera the Brave is actually part of the Heisei series, as evidenced by it being grouped with the other Heisei films in a Heisei Gamera book called Heisei Gamera Perfection. As such, the Millennium era only applies to the Godzilla series.
One of the most notable features of the Millennium series is its staggered continuity. Unlike the Showa and Heisei series, the Millennium series does not follow one single continuity, and consists mostly of standalone films. The continuity of each film is as follows:
- Godzilla 2000: Millennium - This film does not refer to the events of any film before or after it. All that is established is that Godzilla has been attacking Japan for some time prior to the film's events. Godzilla.jp's entry for Godzilla 2000: Millennium confirms that it is in fact a direct sequel to the original Godzilla, and that the Godzilla featured in the film is the second Godzilla in that continuity, after the original 1954 Godzilla.
- Godzilla vs. Megaguirus - Although Godzilla in this film sports the same design as in Godzilla 2000: Millennium, the two films do not share continuity. Godzilla vs. Megaguirus shares partial continuity with the original Godzilla, as Godzilla still attacked and destroyed Tokyo in 1954. However, in this continuity the Oxygen Destroyer was never used and Godzilla simply swam out to sea, only to return and attack Tokai in 1966. Godzilla was not seen again until 1996, when he attacked a plasma reactor in Osaka.
- Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack - Another standalone film, GMK is a direct sequel to the original Godzilla. In this continuity, Godzilla was killed by the Oxygen Destroyer in 1954, but the JSDF claimed credit for killing him in order to avoid facing ridicule and assure the citizens of Japan that they were safe. Eventually, Godzilla was brought back to life and possessed by the restless souls of those killed by the Japanese military in World War II, and returned in 2002 to destroy Japan. This film also makes a passing reference to the 1998 American film, as Taizo Tachibana mentions early on that a giant reptilian monster similar to Godzilla recently attacked New York. A soldier asks if the creature was Godzilla, while another responds that the Americans think so, but the Japanese doubt it.
- Godzilla Against Mechagodzilla and Godzilla: Tokyo S.O.S. - These two films are the only entries in the Millennium series to share continuity, and are often collectively referred to as the "Kiryu Saga." Godzilla Against Mechagodzilla is a direct sequel to the original Godzilla and establishes that Godzilla first appeared in 1954 and was killed by the Oxygen Destroyer. The only change from the events of the original film is that Godzilla's skeleton remained intact instead of being disintegrated. This film also references the events of Mothra and The War of the Gargantuas, including stock footage from both films. The next film, Godzilla: Tokyo S.O.S. is a direct sequel to Godzilla Against Mechagodzilla and makes further references to Mothra, even featuring the character Shinichi Chujo. The events of the film Space Amoeba are also referenced when the corpse of Kamoebas is found on a beach. It is also mentioned that another Kamoebas was seen sometime in the 1980's. Supplementary books for the film establish that the events of several other non-Godzilla Showa era kaiju films occurred in this continuity, including Rodan, Varan, Gorath, Atragon, Dogora, Frankenstein vs. Baragon, and King Kong Escapes.
- Godzilla: Final Wars - Godzilla: Final Wars, despite its numerous nods to previous films and inclusion of stock footage, is an entirely standalone film that shares continuity with no other films. In this continuity, Godzilla first appeared in 1954, prompting the formation of the Earth Defense Force. In the following years, the EDF battled against the countless monsters appearing around the Earth. At an undisclosed point prior to the main events of the film, the Gotengo lured Godzilla to Antarctica and managed to trap him underneath the ice. For the next several decades, Godzilla remained imprisoned in Area G while humanity was kept safe from other monsters by the EDF. It is not disclosed in what year the main events of Final Wars take place, as supplementary materials only refer to it as the year 20XX, but it is presumed to be sometime in the near future.
- All the Godzilla films of this era take place in Tokyo in some way. The only exception is Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack, where Godzilla was heading for Tokyo but is stopped in Yokohama, Tokyo's closest southern city.
- The Millennium series is the first of Toho's Godzilla series to not feature Godzilla as an antagonist who is defeated or killed by humans in the first film. It is also the first series to feature Godzilla battling another monster in the first film.
This is a list of references for Millennium era. These citations are used to identify the reliable sources on which this article is based. These references appear inside articles in the form of superscript numbers, which look like this: 
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