Gaia IV is a planet, a class M planet and the fourth planet in the Gamma Quadrant's Gaia system. The planet is surrounded by an unusual energy barrier which includes a temporal anomaly.


In 2373, the crew of the Federation starship USS Defiant visited the planet and discovered that it was home to eight thousand inhabitants. The inhabitants were in actuality the descendants of the Defiant crew, in a timeline in which the starship was sent back in time to the 22nd century when it encountered the temporal anomaly upon attempting to leave the energy barrier. The inhabitants were erased from existence when the Odo who lived on the planet changed the course of the Defiant to avoid the temporal anomaly. The crew of the Defiant retained their memory of the inhabitants of Gaia IV. (DS9 episode: "Children of Time")

Starfleet later ordered a quarantine of the planet due to the energy barrier and the temporal anomaly. (ST reference: Star Charts)

Gariff Lucsly of the Federation Department of Temporal Investigations thought the causal loop experience by the crew of the Defiant at Gaia IV was one example of how conscientious the Deep Space 9 crew were towards the timestream. (ST novel: Watching the Clock)



planets visited by ships named Defiant
USS Defiant (NCC-1764) GolmiraTraelus II
USS Defiant (NX-74205) (I) 2371 KaremmaCallinon VIIFounders' homeworldTrillCardassiaMeridianOrias IIIEarth
2372 BajorCha'XirracFree HavenVandros IVclass L planet crash siteNew Founder homeworld
2373 Torga IVAjilon PrimeCardassiaSolosos IIIGaia IV
2374 Argolis Cluster planet • Chin'toka planets
2375 AR-558
USS Defiant (NX-74205) (II) Europa NovaTorona IVNarendra IIIVahni Vahltupali homeworld • PrentaraLuthiaBajor
Defiant (mirror universe) Bajor
Gamma Quadrant planets and planetoids
Alamenta IIArgrathaBatrusBopak IIIBraxBronis IICaldonia IIICallinon VIIDionby IVDosa IIEcoEeEmpersaEnskith VIErabus PrimeErrikang VIIFounders' homeworldGaia IVHoek IVIdran IVInnerol VKaremmaKeltaraKendarayKigus IIIKurrill PrimeLaertesLesurgis XXXIILodontus IIIMerakord IIMeridianMundahlaNew BajorNew Founder homeworldOasonOverne IIIParada IVRindamil IIIRintannaShelvar VISkrreeT-Rogoran PrimeTevlin-DeThreska IITorad VTorga IVVadris IIIVandros IVVaralaVanìmelVhetti PrimeVrynax IIYadera IIYadera PrimeZaria Vunnamed Gamma Quadrant planets and planetoids GammaQuadrant

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