Long ago, a great, destructive war between humans the Orgs was ended; the people of Earth were believed to be the victors. But now, 1,000 years later, the Orgs have returned. And five new warriors have been selected by the Power Animals to claim the responsibility of protecting humanity once again, by becoming the Hyakujuu Sentai, Gaoranger!
A veterinarian adept at communicating with the hearts of animals is chosen by Gao Lion to lead the team of Gaorangers; warriors selected by their respective power animals to defend the earth from the villainous Orgs.
As Kakeru settles into the responsibilities of being the leader, Wire Org attacks and shows him the true nature of the Orgs.
With Highness Duke Shuten now awoken, the Orgs further establish their regime. Meanwhile, the Rangers race against time to defeat Camera Org who's draining the life-force of random citizens, among them is Gaku.
Sotaro's lack of confidence during a ghost hunt causes a rift in his friendship with Kai, who soon finds himself captured by Shrine Bell Org. Shuten hunts for a mysterious energy-emitting stone.
The search begins for the first of several Power Animals said to be hidden in various parts of country. Trouble finds Tetomu as she steps out of Gao's Rock to aid the rangers.
After pursuing the bride-napping Wedding Dress Org into a building hosting a wedding reception, the rangers stake out in disguise before more brides are harmed.
Kai's recurring nightmare envisioning Gao King's defeat brings the rangers to a harbor where they find Boat Org who possess a bottle meant for a boy Blue promises to retrieve.
A run-in with Signal Org's mind-wiping powers has Kakeru returning to his former life. The rest of the Gaorangers must decide whether they should have him return to the team or leave him be.
Gaku encounters two mysterious twins who are in need of his assistance. The rangers' G-Phones are rendered inoperable after an encounter with Cell Phone Org.
Weakened from a previous battle, the rangers are instructed to travel to a sacred forest to retrieve a special mushroom that can heal Gao Lion, but encounter a mysterious group of people that need their help.
Sae prepares to meet with her father for the first time since leaving Kagoshima; while Shuten tries to create the strongest possible Org with his power.
The Gao Egg has reached it's final stage requiring the Gaorangers to travel to a valley flowing with Gao Soul to help it hatch. Unaware, a doppelganger walks among them.
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