During the course of the game, an alien invasion takes place, lead by cybernetic beings dubbed the Bio-Mecha (or Bio-Mechs). Gamera joins forces with the international organization called the Science Defense Academy against the invaders, who soon counterattack with the creation of the Neo-Gyaos; mutant variants of the 1995 creatures, of numerous shapes, sizes, and destructive capabilities.
The game contains several cut-scenes with real live actors. The game can be heard in English or in Japanese, with Japanese subtitles.
In the game, the player is part of the United Nations Military, who can loosely command Gamera to attack enemies, as well as having the power to attack with the player's ship's laser. Gamera is far more powerful, however.
The game plays somewhat like a rail-gun game, as most of the stages are relatively linear. The game travels through a variety of settings, such as cities, oceans, forests and caves.
With some exceptions (Gyaos Man, Quicksilver, M-Machine-Dread VII, Bionic Gyaos, etc.), the majority of the game's original monsters' official names are unknown to American audiences. The following lists are mostly comprised of descriptive names for the monsters, based on the characters' appearances and abilities.
Neo-Gyaos are the genetically engineered, custom built "attack beasts" of the Bio-Mechs created from the genes of Super Gyaos, which the aliens had stolen from the Science Defense Academy. The final Neo-Gyaos monster, the colossal Bionic Gyaos, also known as the Dragon Fortress, is a threefold hybrid of Gyaos and Gamera DNA along with Bio-Mech technology.
- Neo-Gyaos (Two-Headed Gyaos)
- Gyaos;Man (Kind)
- G;Bionic Gyaos (The Dragon Fortress)
- Gyaos-Armadillo (Armored Gyaos)
- Serpentine Gyaos
The alien invaders behind the Neo-Gyaos are cybernetic entities, often appearing as gigantic robots or robotic vehicles, who share Gyaos genes in their biological half. It's never made fully clear but it's possible that the Bio-Mechs may have attempted to invade Atlantis in the past and recovered some of Gyaos' cells, or are themselves Atlantean in origin and only now returning from deep space to reconquer their birth world. The written language and communication of the Bio-Mechs is the same as the Etrurian runes found on the atoll in which Gamera was entombed.
- UFO (Bio-Mech Mothership)
- M-Machine-Dread VII
- Quicksilver (Dolphind)
- Nomad Viper
- Bio-Mech Air-Carrier
- Nomad Chip
- Bio-Mech Fighters
- Bio-Mech Hover-Blockade Drones (separated units & combined)
- Bio-Mech Saucer Drones
- Bio-Mech Sea Speeders
- Bio-Mech Forest Walkers
- Bio-Mech Beam-Barrier Drones
- Bio-Mech Boomerang Drones
This is a list of references for Gamera: 2000. 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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