All Zoids Genesis released episodes
A young boy, Ruuji Familon, is assisting his father in recovering a Zoid from the bottom of a lake when his village is attacked by silver-plated "Bio-Zoids". None of the villagers are able to pilot the excavated Zoid, until Ruuji accidentally falls into the cockpit and activates it. He names the Zoid "Murasame Liger", and, with it, is able to fight off the invaders.
A Lance Stag and Sword Wolf appear and assist Ruuji in defeating the invading Bio-Zoids and dousing the fires in the village. The Zoids' pilots introduce themselves as Re Mii and Ra Kan, and explain that the Bio-Zoids' target was the village's Generator. When the Bio-Zoids attack again, Mii and Ra Kan are incapacitated, leaving Ruuji to fight on his own.
Ruuji is about to be crushed, but Murasame Liger defends itself of its own accord. Heartened, Ruuji fights back and drives away the Bio-Zoids for good, but, during the battle, the village's Generator is damaged and shuts down. Ruuji, Mii, and Ra Kan leave the village in search of a mechanic who can repair the Generator.
The group arrives at a trade city. While Mii and Ra Kan go to scout out the area, Ruuji takes Murasame Liger into the city by himself, hoping to find a Generator mechanic. He is treated to lunch by a girl named Kotona, and while he is away from his Zoid it is stolen by a gang of thieves. Kotona reveals that she had planned all along to use the Liger as bait so she could catch the thieves. They use Kotona's bird-type Zoid, Rainbow Jerk, to catch up with the gang and recover Murasame Liger.
While Ruuji continues his search for a Generator mechanic, he runs into Kotona again. Kotona's friend Garaga has been harassing her, so she asks Ruuji to pretend to be her fiance in order to discourage him. Garaga challenges Ruuji to a Zoid battle to win Kotona's love. Ruuji fights against Garaga's Deadly Kong, but Ra Kan interrupts the battle.
Garaga is revealed to be the leader of an anti-Digald guerrilla force. When his friends come under attack by Digald Bio-Raptors, Garaga enlists the help of Ruuji and the others to defend them. The group drives off the attacking Bio-Zoids, but Mii predicts that this is only the beginning.
The Bio-Raptors mount another attack on Garaga's base. The rebels plan a trap to defeat the Digald forces, but their plan is turned against them. Kotona is able to evacuate the rebels, but Ruuji and the others are surrounded and trapped inside the hideout. Murasame Liger manages to break down the wall and the group escapes into the valley.
The group leave for the village of Sakusa to find a Zoid mechanic, who is a friend of Ron's. However, they are forced to turn back after Rainbow Jerk runs out of Reggel. The city has been taken over by Digald forces, so Ruuji sneaks in and meets up with Haara. They form a plan to take Reggel from the Generator without Digald catching them. Garaga and Ra Kan distract the Bio-Raptor guards, and Ruuji retrieves the Reggel, but he is spotted by Zairin, and the Mega-Raptor leads a counter-attack against them.
Having escaped from the Bio-Raptors, Ruuji and the others arrive at Sakusa village, and meet the mechanic who was repairing Ron's Zoid, Bamburian. Ron wants to test Bamburian in battle, and challenges Ruuji to a friendly match. Ruuji loses the battle, and becomes determined to prove himself. He fights against a wild Zoid by himself, but is overwhelmed when more wild Zoids show up and attack him. He is saved by an unknown Zaber Fang-type Zoid.
The morning after Ruuji left, he still has not returned. Kotona goes out to search for him, and comes across him staying at the home of the man in the Zaber Fang-type who saved him from the wild Zoids. Kotona recognizes the Zaber Fang as Soul Tiger, and its pilot as Seijuurou, supposedly the greatest Zoid pilot ever. Ruuji begs Seijuurou to teach him to become stronger, and he agrees to travel together with them.