[[quoteright:191:http://static.tvtropes.org/pmwiki/pub/images/UltramanGaia_2937.jpg]]
->''"Ultraman! The Earth is in danger! I need to be like you! I need your power! Please, give it to me!"''
-->-- '''Gamu Takayama''', speaking to Ultraman Gaia in the first episode

'''''Ultraman Gaia''''' is a {{toku}}satsu series that aired from September 5, 1998 to August 28, 1999 on TBS. It is the thirteenth entry in the ''Franchise/UltraSeries'', with Creator/ChiakiKonaka as head writer.

''Ultraman Gaia'' takes place in yet another universe, one that is totally different from the world of the original Ultramen(the inhabitants of the Land of Light), as well as the world of ''Series/UltramanTiga'' and ''Series/UltramanDyna''. It is the first series to feature two Ultramen as the main characters -- Ultraman Gaia and Ultraman Agul, [[RedOniBlueOni both having conflicting philosophies in regards to defending the Earth]] from a mysterious, malevolent and extremely intelligent cosmic entity.

The first half of the series explores the growing tension between them, and their eventual clash. The second half has them reconcile their differences so they can defeat their common enemy.

----
!!''Ultraman Gaia'' provides examples of the following tropes:

* ADayInTheLimelight: Team Seagull in episode 9, Team Crow in episode 10.
* AIIsACrapshoot: The CRISIS integrated-circuit supercomputer. Although it manages to predict in 1997 that Earth would be annihilated by something known as "Kongenteki Hametsu Shorai Tai" (Entity that Brings Radical Destruction), it calculations had been sabotaged by the monster Zorlim, and it gets infected by a computer virus in episode 27.
** Averted by Gamu's PAL, which works perfectly as an auto-pilot and even survives being shot down.
* AirborneAircraftCarrier: Aerial Base.
* AllYourBaseAreBelongToUs: Hiroya invades Aerial Base with surprising ease in episode 18, by taking advantage of Agul's ability to teleport through certain materials and just transforming back to save power.
** Later, in episode 27, a computer virus manages to completely override XIG's computer systems.
* AlternateUniverse: From the Showa-era Ultras (''Series/{{Ultraman}}'' to ''Series/UltramanEighty'') and [[Series/UltramanTiga Tiga]]/[[Series/UltramanDyna Dyna]]'s universe.
* AntiHero: Hiroya Fujimiya / Ultraman Agul is a Type V. Though he occasionally helps Gaia in certain battles, he reminds Gaia that their alliances are merely because it is his duty to protect Earth (the planet, not the humans on it) due to his [[HumansAreTheRealMonsters belief]]. [[spoiler:After suffering an [[HeroicBSOD Anti-heroic BSOD]] in episode 26, [[PutonaBus he is presumably killed by Zorlim and doesn't appear]] until ten episodes later, and only leaves this trope for good when he finally gets his powers back in episode 41.]]
* ApocalypseCult: There is one that makes sporadic appearances throughout the series. They give out a lot of leaflets.
* AttackOfTheFiftyFootWhatever: It's an Franchise/UltraSeries. Standard procedure.
** The nature of the series means that the threats tend to be towards Earth rather than just humanity (there aren't any serious invasion attempts in the show), and so the 'Whatever' tends to be a few orders of magnitude larger than just 'fifty feet' [[DarkerAndEdgier far more frequently than is comfortable]].
* {{Badass}}: Gaia and Agul, naturally.
* BadassBookworm: Gamu Takayama. A scientist who can assume a superhero form to fight monsters. Hiroya Fujimiya too, but Gamu is the more obvious example. Something of a subversion for the franchise, as this is only time TheSmartGuy(s) transforms into the Ultra.
* BadassCrew: XIG. The individual teams even more so.
* BarBrawl: Fujimiya and Reiko gets into one in episode 25. The morons who started it only helped to fuel Fujimiya's {{Humans Are Bastards}} mindset.
* BashBrothers: Gaia and Agul, [[spoiler:after solving their differences]].
* BigBad: [[spoiler:Zogu]]
* BigFancyCastle: Gamu meets up with Catherine Ryan in one when he was in Germany in episode 42.
* BladeBelowTheShoulder: Agul's Agul Blade
* BlobMonster: Apatee (episode 3), Algyuros (episode 16) and Meemos (formed from the DNA of previous two in episode 27).
* BoisterousBruiser: Team Hercules. Their MO boils down to 'drive up to the Kaiju and shoot it'; when that fails, it becomes 'fight the Kaiju on foot'.
* BusmansHoliday: Gamu gets one in episode 5. He is ordered to take a day off and go inform his parents in Chiba that he's joined XIG (and quit the university). On that same day, [[MonsteroftheWeek Bokurag]] appears to attack that very place.
* TheCape: Ultraman Gaia.
* CallBack:
** In episode 24, just as Gaia is about to perform his {{Finishing Move}} on Zonnel II, he recalls the agonizing last moments of C.O.V. (episode 1), Psycho Mezard II (episode 19) and Pazuzu (episode 22). He decides not to destroy Zonnel II, instead using a beam to calm the kaijiu.
** Episode 27 has a scientist mentioning how Meemos was created from the DNA of Apatee (episode 03) and Algyuros (episode 16).
* CriticalAnnoyance: In a subversion of the trope as it usually plays out in the franchise, the Life Gauge on Gaia and Agul's chests begin blinking only when they run low on energy.
* {{Crossover}}: In every movie Gaia appears in.
* DarkerAndEdgier: Compared to both [[Series/{{Ultraman Tiga}} its]] [[Series/UltramanDyna predecessor]] and most of the ''Franchise/UltraSeries''. It's never something you couldn't show to children, but the threats tend to be on a ''planetary'' scale on a regular basis. It made even obvious by the generally serious tone of the series, which is in stark contrast to the upbeat and light-hearted atmosphere of its [[Series/UltramanDyna predecessor]].
* {{Deuteragonist}}: Hiroya Fujimiya / Ultraman Agul
* TheDollEpisode: Episode 19 -- Lilia's Maze.
* EverythingsBetterWithDinosaurs:
** Episode 20 has Geschenk, based on a Velociraptor.
** Algona in episode 35.
* EverythingIsOnline: XIG's control systems, which is why a [[AIIsACrapshoot rogue computer virus]] was able to [[AllYourBaseAreBelongToUs severely disrupt the Aerial Base]]. After Atsuko manages to eliminate it, the virus went to Geobase, [[FromBadToWorse merged itself with the DNA samples of previously defeated monsters Apatee and Algyuros and transformed itself into an imitation of Ultraman Gaia]].
* EvilTwin: Played with by several [[MonsterOfTheWeek Monsters of the Week]] in this series.
** Episode 3 has Gaia fighting against Apatee, said monster has a Life Gauge identical to Gaia's, even imitates Gaia's fighting pose at the start of their battle.
** Later on in episode 16 Algyuros transforms itself into an imitation of Ultraman Agul, but with [[RedEyesTakeWarning red eyes]] and a [[SlasherSmile creepy smile]].
** Then in episode 27, Meemos, a monster which contains the DNA of both the previously mentioned monsters, manages to transfrom itself into an imitation of Ultraman Gaia Version 1.
** Yet another imitation of Ultraman Agul appears to fight Gaia in episode 38 after being summoned by the Queen Mezard.
** The most obvious example - Episode 42: Gamu vs. Gamu.
* FinishingMove
** Ultraman Gaia's Photon Edge and Quantum Stream.
** Ultraman Agul's Photon Crusher.
* GadgeteerGenius: Gamu. He designed the [[TransformationTrinket Esplender]], as well as the repulsor lifts that allow Aerial Base and the XIG fighters to defy gravity.
* GoingDownWithTheShip / {{Suicide Attack}}[[spoiler:: Commander Akio Ishimuro stays back to use the almost destroyed Aerial Base to ram into Mokian in episode 47 in a last-ditch attempt to destroy the kaijiu. Luckily, [[SubvertedTrope Gaia bails him out in the nick of time]]. As a bonus, Mokian is successfully destroyed.]]
* HenshinHero: Minus their ability to transform into Ultramen, Gamu and Fujimiya are just regular humans.
* HumansAreBastards: This is Hiroya Fujimiya's mindset at the start of the series.
** HumansAreTheRealMonsters[[spoiler:: The Death God reveals in episode 47 that the {{Big Bad}} feels that humans are a threat to the universe. The solution is to remove them from the equation.]]
* {{Kaiju}}: Two types. Those from Earth and those from space.
* MeaningfulName: Ultraman Gaia appropriately gets his name from the [[http://en.wikipedia.org/wiki/Gaia_Theory Gaia hypothesis]], which states that the Earth functions like a giant, living creature.
-->'''Gamu''' ''(to Atsuko)'': "Some people say that the Earth is a living being named Gaia..."
-->'''Atsuko''': "Gaia?"
-->'''Gamu''': "What do you think of 'Ultraman Gaia' for the giant's name? [[AwesomeMcCoolname Gaia's a cool name, right?]]"
* LoadsAndLoadsOfCharacters: Probably holds the record for being the {{Franchise/Ultra Series}} with the most number of characters. This trope comes into play mainly due to the nature of XIG. Unlike the defense teams of previous entries in the {{Franchise/Ultra Series}} which usually has one team of about five members as the sole focus of the series, XIG consists of multiple three-person teams with specialized roles. There are also three commanders and three {{Bridge Bunnies}}(though one is a support recruit). Then there are the members of G.U.A.R.D.(the American division and the Japanese division). Then there is the trio from KCB, the Alchemy Stars Network and Gamu's peers at Jounan University. And the list goes on.
* MindScrew: What happens to Gamu in episode 6, courtesy of Gan Q.
* MonsterOfTheWeek: Following the tradition of a typical ''Ultra'' series.
* TheMovie: ''Ultraman Tiga & Ultraman Dyna & Ultraman Gaia: Battle in Hyperspace'' (1999) and ''Superior Ultraman 8 Brothers'' (2008), both [[NonSerialMovie unrelated to the series' storyline]].
* MundaneUtility: The nature of Gaia/Agul's powers and transformation means that Hiroya can easily infiltrate the Arial Base control room and lock everyone out... and Gamu can just teleport in as Gaia (episode 18).
* MythologyGag
** In episode 45, Blitz Blotz, a black and white avian monster destroys a G.U.A.R.D. base resembling the [[Series/{{Ultraman}} Science Patrol headquarters]].
** Before Gamu using his Esplender to store Gaia's essence, Gamu transform into Gaia with photoelectron tube, mirroring [[Series/{{Ultraman}} Shin Hayata's transformation as Ultraman via Beta Capsule]].
** Episode 18 shows that there's apparently a restaurant/cafe called '[[Series/UltraSeven Eyeslugger]]' somewhere in this universe's Tokyo.
* NextSundayAD: The series was first aired from 1998 to 1999, but is set in the year [[TurnoftheMillennium 2000]], with flashbacks to key events taking place in the late [[TheNineties 1990s]].
* OhCrap: Agul's reaction in episode 5 when Bokurag[[spoiler: reveals its {{Healing Factor}} powers.]]
* OneWingedAngel: When Agul attacks the Death God in episode 48, he transfoms into Zebub. From [[http://img1.wikia.nocookie.net/__cb20130622193518/ultra/images/4/4e/Shinigami.jpg this]] to [[http://img2.wikia.nocookie.net/__cb20130622195112/ultra/images/6/64/Zebub.jpg this]].
* PeopleInRubberSuits: It is a {{Toku}} series after all.
* PetTheDog:
** When Fujimiya saves a young girl, Yuki from a collapsing building during Geschenk's attack in episode 20.
** A bigger example in episode 24, when he saves an entire hospital from the wrath of Geel II. He had awakened that monster earlier in the episode, having a change of heart when he saw the fear of the fleeing patients and staff, as well as a young boy who looked up to the Ultramen as heroes.
* ProductPlacement: One of the Team Crow members is seen listening to rock music using a Panasonic CD player in episode 10.
* PutOnABus: [[spoiler: After the events of [[WhamEpisode episode 26]], Fujimiya / Agul is not seen again for quite a while.]]
** [[spoiler: TheBusCameBack: Fujimiya returns in episode 36. Having given his powers to Gamu, it is only in episode 41 that Agul makes his comeback with a new {{Super Mode}}.]]
* RedOniBlueOni: Gamu Takayama / Ultraman Gaia and Hiroya Fujimiya / Ultraman Agul. Just look at their respective skin colors when they are Ultramen.
* RewindReplayRepeat: Happens a few times with Kenji Tabata and his videotapes.
* RunningGag:
** Every time Team Hercules lands in the Stinger, they knock at least one bicycle over.
* ScienceHero: Gamu Takayama, who gets help from his friends at Jounan University too.
* SecretIdentity: Downplayed, though Gamu does a decent job of keeping quiet about being the alter ego of Gaia. Fujimiya, on the other hand, does not really give a damn.
* ShoutOut
** [[ActionGirl Catherine "Cat" Ryan]] dresses up like [[Franchise/{{Terminator}} Sarah Connor]].
** Episode 42 has Gaia engaging in a swordfight with [[MonsterOfTheWeek Bizorm]] using [[Franchise/{{StarWars}} laser beams]].
** Episode 5 feature monster call Bokurag. The direct-to-DVD ''Once again Gaia'' has a flying monster called Byakhee and underwater city Celephais. Yeah, tributes to Franchise/CthulhuMythos.
* StoneWall: The Stinger, often used by Team Hercules, is unusually tough and reliable, but slow as molasses.
* StoryArc: Despite retaining the traditional {{Monster Of The Week}} format and having most episodes having a somewhat self-contained story, Ultraman Gaia is the first Ultra Series to make use of continuing story arcs.
* SuperpoweredAlterEgo: Averted, surprisingly. Gaia and Agul ''are'' Gamu and Hiroya, imbued with power and in giant form.
* SuperMode: Gaia's Supreme Version and Agul's Version 2.
* SurprisinglyGoodEnglish:
** Courtesy of Georgie Leland. Her actress, Maria Theresa Gow is of Scottish and Filipino descent.
** There is also this gem in episode 9 from Michael Simmons, the African-American member of Team Seagull. Simmons is portrayed by [[http://www.imdb.com/name/nm0968572/ Samuel Pop Aning]], who is from {{UsefulNotes/Ghana}}.
--->''"May God be with you."''
* SymbioticPossession: Between both Ultras and their human hosts. Par for the course for Ultramen (unless they [[Series/UltraSeven make]] [[Series/UltramanLeo them]] [[Series/UltramanMebius up]]) - but subverted here as it's the ''humans'' who take over the giants' forms.
* TankGoodness: How the American division of G.U.A.R.D. responds to Zonnel II's appearance in Arizona. Zonnel II took out the tanks in seconds, and a good number of soldiers died that day.
* ThemeSongPowerUp: Happens in episode 49.
* TransformationTrinket: Gaia's Esplender and Agul's Agulator.
* TokyoIsTheCenterOfTheUniverse: Subverted. Despite most monster attacks taking place in Japan, Gaia has fought monsters in Canada, United States and Germany.
* TorchesAndPitchforks: Some villagers in episode 13 become this, under the influence of Psycho Mezard. They gave the KCB trio a hard time.
* WasOnceAMan: Tsuchikera in episode 20, with a [[TragicMonster tragic]] background story similar to that of [[Series/UltraMan Jamilla]].
* WhamEpisode:
** [[spoiler: Episode 23: Gamu is dismissed from XIG.]]
** [[spoiler: Episode 26: Gaia obtains his {{Super Mode}} from Agul, Fujimiya gets {{Put on a Bus}}. Gamu is allowed back at XIG.]]
** [[spoiler: Episode 36: Fujimiya comes back.]]
** [[spoiler: Episode 41: Fujimiya finally regains his powers.]]
** [[spoiler: Episode 47: Aerial Base is '''completely''' destroyed, XIG base of operations is now GEOBASE.]]


----