Gaia is the thirteenth and final episode of Tenchi Muyo! War on Geminar.
Summary
All the forces from various nations have banded together to take down Babalun before he can fully revive the Sacred Mechalord Gaia. They methodically foil all of the countermeasures they thought would make the Holy Land's fortress wall impregnable and are able to make their way through the first wall of defense. Forcing Lan and her bandit groups to flee.
It seems the Swan led army may succeed and they will be able to break in and stop Gaia's completion. Babalun says he just needs a little while longer. Dagmyer, being able to overcome his trauma, comes to his aide. In his Seikijin, he asks to duel Kenshi directly and if he doesn't, he says he'll overload another core reactor like the one they tried to destroy Kenshi with earlier. Destroying himself, everyone around, and obliterating the entire area. It doesn't take Kenshi much time to defeat Dagmyer, but this small distraction was all Babalun needed. Gaia has been revived with Doll inside. It seems that within the completed Gaia she can overcome the programming that usually stops her from fighting him. Kenshi faces off against her and, with the monolith sword, he is able to fight on par with Gaia. As he attacks, he seems to be dealing it serious damage.
The tables are turned when Babalun dissolves into goo and merges with Gaia, revealing that he is actually the personification of Gaia and its core crystal resides within his eye. Together with his Mechalord, he is able to heal the damage and begins to overpower Kenshi. Telepathically, Kenshi hears Doll/Mexiah asking him to save her from Babalun/Gaia. Kenshi puts all he can into a swing of the monolith sword. The sword shatters, but in its place, for a moment, Kenshi generates a Light Hawk sword in its place, slicing though the mechalord's body and destroying it, saving Doll/Mexiah within. Babalun, barely able to control his human form, emerges from the scraps, vowing to kill Kenshi. Ulyte reveals himself and brings out the device Rea Second took from the Barrier Workshop, a beam weapon that can erase a core crystal. Pointing it straight at the crystal in his "brother's" eye, he fires, shattering it and finally killing the being that had been called Babalun. Ulyte collapses and transforms, revealing that all this time he had been sharing his body with Rea Second. Just as Babalun had Gaia's crystal implanted and Mexiah had Doll's crystal, he had been implanted with Rea's.
Lashara, Maria, Yukine, Mexiah, Chiaia, Aura and Wahan all fight over who holds a claim to Kenshi, at which point Lithia points out that she, Morga and all the other girls in the Academy also want marriage rights to Kenshi. They come to a decision that whoever catches him gets him first. Kenshi runs for it as Rea watches in amusement.
On the sidelines of this, a despondent Dagmeyr finds a shard of the shattered Gaia crystal and cuts himself on it. A piece of the crystal seemingly infecting him. In the shadows, Lan spots Dagmeyr and decides she will capture him to get whatever she can out of him. What she doesn't notice is the loyal Emera coming up behind her, knife ready.