Pre-series
- 939: Future Gao Warrior Tsukumaro Ogami is born.
- 979: Future Gao Shaman Tetomu is born. (Quest 05)
- 1001: The Ogre Tribe Org under Hyakkimaru attack humanity, leading to the Power Animals and the Gao Shamans to fight against them and leading to their defeat, including that of their leader GaoGod. In a desperate attempt to defeat the Orgs, the shaman Shirogane dons the evil Wolf Mask against head Shamaness Murasaki's order in hopes of using it's power to make his Power Animals stronger; it succeeds by granting them the transformation of GaoHunter, but transforms them into the "Wicked Beasts" while ultimately turning Shirogane into the spirit possessing the mask, Duke Org Rouki. As a final act before becoming fully possessed, the shaman asks his five partners to seal him away, doing so but as Rouki gains full control of his body even as they enter slumber on Mt. Onitsuka. (Quest 15, 23)
- 1947: Charcoal Grill Org gives up violence to be a chef after an attack leaves behind food that is enjoyed by two children who find it. (Quest 34_
- 1977: Kakeru Shishi/GaoRed is born.
- 1978: Gaku Washio/GaoYellow is born.
- 1980: Soutarou Ushigome/GaoBlack is born.
- 1982: Kai Samezu/GaoBlue is born.
- 1984: Sae Taiga/GaoWhite is born.
- 1991: A forest in Yuhigaoka is torn down and a town is built on its remains. (Quest 10)
- 1999: Martial artist Sae Taiga convinces her father Toranosuke to let her leave Kagoshima and study in Tokyo. (Quest 11)
- 2000: The Ogre Tribe Org begin to awaken after a thousand years; forcing Tetomu, the shaman of Gao Rock and guardian of the Animarium, to reawaken and select a squadron to fight them. (Quest 02)
- Pilot Gaku Washio is the first to be chosen, becoming Gao Yellow around the Tanabata period; his first battle against Scooter Org does not go as planned and leads to him and Tetomu sealing it down instead of destroying it. (Quest 20)
- Student Sae Taiga and freeter Kai Samezu soon follow, respectively becoming Gao White and Gao Blue in August.
- Former sumo fighter Sotaro Ushigome becomes Gao Black in December after believing he had lost his girlfriend at a flower shop, two months prior to the discovery of Gao Red. (Quest 19)
Series
- As the Gaoranger continue to battle the Orgs, they are forced into finding a fifth member after an Org is suddenly joined by a second in combat, leading to greater problems than anticipated. After using his ability to read animal hearts to stop a rampaging elephant, veterenarian Kakeru Shishi is sent to the Animarium by the Gaoranger, where he bonds with Gao Lion and becomes the new leader of the squadron, Gao Red. With his new teammates, the five Gaoranger defeat the two Org by combining their powers for the first time. (Quest 1)
- After the defeat of his partner Plugma Org, Turbine Org is approached by two Duke Orgs who make him grow. At the instruction of mentor Tetomu, the Gaoranger summon their Power Animals to make quick work of the giant Org. When another Org is later grown, the Power Animals instruct them to combine them into the form of Gaoking. (Quest 2)
- The Gaorangers defeat Camera Org. Highness Duke Org Shuten awakens to lead the Orgs, but gives a peculiar instruction to the Duke Orgs to follow the orders of the stone Org Master. (Quest 3)
- While near Mikuni, both Gao's Rock & Shuten sense a flux located near a temple in Raionji; after the Gaoranger obtain it when Shuten hurts himself on it, it is revealed to be a mysterious orb containing the crystal for Gao Elephant and a scroll that reveals four other Power Animals that became lost in the past. With Sae's assistance after traveling to Okuyama, Tetomu awakens Gao Elephant to assist them. (Quest 4,5)
- The Gaorangers defeat Wedding Dress Org. (Quest 6)
- After having a strange dream near Nagai, Kai Samezu realizes it as another Power Animal, revealing a crane to be Gao Giraffe. The Gaorangers defeat Boat Org. (Quest 7)
- The Gaorangers defeat Signal Org (Quest 8)
- After being assisted by two mysterious boys in his home district of Oyado in Tokyo, Gaku Washio gains the power of Gao Bear and Gao Polar; however their power overwhelms Gao Lion making it fall ill. (Quest 9)
- In order to treat Gao Lion, the team head to Yuhigaoka New Town to find the Radiant Mushroom, where they are sent back in time to retrieve Gao Gorilla and gain the Gao Muscle formation; when they return, they find the mushroom in a shrine waiting for them. (Quest 10)
- Using a special ritual, the Radiant Musrhoom is dropped into Gao Rock's sacred spring where it becomes the Gao Egg, then presented with Gao Souls from Black Feather Valley in order to hatch into Piyo, the true form of the potential "Gao Heart". After easing crushing them in combat, Shuten uses an empowered Freezer Org to freeze all Gao Souls simultaneously. However, the power of Piyo reawakens the souls allowing the team to defeat the Highness Duke and kill Tsuetsue and Yabaiba. (Quest 11-13)
- After he grows himself, Piyo reveals itself as the Soul Bird, which the team insert into a repowered Gao King to defeat him. The second Highness Duke Org, Ura, reawakens within the Matrix and takes the power from Shuten after he suddenly revives, ending his life. Ura revives Yabaiba and Tsuetsue in order to assist him. (Quest 14)
- When a special Highness Duke, Lost Highness Duke Rakushaasa, returns and steals the battle spirits of the other Gaoranger, the team is forced to undergo training with a special squadron of past Sentai heroes (including Big One, Red Falcon, MegaPink, GingaBlue and GoYellow) to gain the power and ability to defeat him. The highness is ultimately defeated by Kakeru empowered by the spirits of the previous 24 Red Rangers. (Gaoranger Vs. ''Super Sentai)
- Ura heads to Mt. Onitsuka as the Gaoranger are distracted in order to use a full moon night to revive another Duke Org, Rouki. The new Duke crushes the Gaoranger while stealing and sealing Gao Elephant from Sae. (Quest 15)
- While trying to pursue Rouki, the Gaoranger discover that he possess three Power Animals of his own, which he later uses to combine into their Gao Hunter formation and capture Gao Giraffe. (Quest 16, 17)
- The Gaorangers defeat Clock Org. (Quest 18)
- During the night of the new moon, the effects of the Wolf Mask reach it's weakest point, changing Rouki back into a human for the first time since sealing which is seen by Kakeru. Gao Bison becomes severely hurt when helping the Gaoranger defeat Glasses Org. (Quest 19)
- As Tetomu and Gaku deal with the unsealed Scooter Org upgraded to Bike Org, the team fight Rouki to a draw with their Power Animals, losing the bears in the process. Amidst the battle, Rouki captures Tetomu, but begins to awaken new memories seeing her with shaman Murasaki's necklace. This is furthered by the sudden appearance of Gao God, who starts forcing Rouki who he really is. (Quest 20)
- While the Gaoranger realize the potential human nature of Rouki, he is placed under an ultimatum to help the Duke Orgs in a plan that ultimately puts Gao Bison out of commission. However due to his awakening human side, Ura implants an Org insect inside his body to force greater obedience. (Quest 21, 22)
- Shortly after the brainwashed Rouki turned over the four stolen Gao Jewels to Ura, the Gaoranger confront Rouki a final time during the first full moon after his release, unwilling to fight him anymore. As the battle turns desperate, Gao God creates a lunar eclipse turning Rouki back into Shirogane and allowing them to discover his origin in a brief opening. Seeing Gao Hunter as the source of his evil power, the team are joined by two new Power Animals, Gao Rhinos and Gao Madillo, whose Gao King Striker finisher removes all evil within the Wicked Beasts and destroys the Wolf Mask, breaking Shirogane free from Rouki's control. (Quest 23)
- Shirogane chooses to not join the Gaoranger at first due to a ploy to get back the Power Animals he stole, which Ura decides to use for his Chimera Org project. After failing and watching the Gaoranger become crushed due to his action, the ancient warrior makes a futile attempt to fight the chimera, inspiring the Power Animals to purify the three previously corrupt Wicked Beasts, who grant Shirogane the G-Brace Phone to become Gao Silver and change their evil Gao Hunter form into the good Gao Hunter Justice. Using this new form, Shirogane destroys the Chimera Org and ultimately appears to kill Ura for using him; but still chooses to not join the Gaoranger for his redemption, leaving after he returns the stolen Gao Jewels. (Quest 24)
- Not quite dead, Ura "uses" Duchess Org Tsue Tsue to briefly transform her into the Highness Org Onihime; when she's defeated, his gem with his essence sinks into the ground. (Quest 25)
- Ura revives as the Thousand-Year Evil gains sentience, first attempting to use the Wolf Mask to be reborn as Rouki until the Gaoranger defeat it again. After Rouki is destroyed, Ura begins to infuse the mysterious power within various Orgs, allowing for the Gaoranger to keep fighting it as it is destroyed over and over, growing in power in the process. It ultimately appears to culminate with the return of Gao Deers, whom after making up with Shirogane for eliminating its musical connection to Murasaki in the past, seals the evil power within a bubble. (Quest 26-30)
- Using a special process of a full moon aligned with the Thousand-Year Evil's bubble, Ura tries to lure Shirogane into refusing with it one last time to transform again into Rouki; however Gao Silver finally fully rejects the power completely. This effect ultimately allows for Ura to fuse with the power himself, mutating into his Ultimate Form which is powerful enough to kill four of the Gaoranger instantly. As Kakeru and Shirogane try to stop Ultimate Form Ura, the deceased Gaoranger are approached by a mysterious boy who makes them form a relief to save their friend. Their success allows for Gao Red to gain the Falcon Summoner and the Power Animal Gao Falcon as they revive. The team use Gao Falcon's main mech form, Gao Icarus, to defeat Ura's Ultimate Form, then work with Shirogane to destroy the Highness forever. (Quest 31)
- Rasetsu, a third Highness Duke, awakens with his own Dukes Kyurara & Propla with their first action to eat cities in human society. The Gaoranger defeat Rasetsu's dukes while Kakeru protects Fuutaro, a boy living in Kamiuro New Town's building site. Tetomu tries to lure Fuutaro to her with food, briefly attracting Rasetsu's interest before she gets away. When Kyura and Propla grow, the Power Animals refuse to come down until the spirits of the deceased of the Animal Rock tomb are quelled. (Quest 32, 33)
- The Gaorangers defeat Charcoal-Grill Org. (Quest 34)
- The Gaorangers defeat Blacksmith Org. (Quest 35)
- During a battle with Magic-Flute Org where he blocks the call for the Power Animals from reaching the Animarium, Fuutaro secretly transforms into Gao God to intervene and stop the song; confusing the Gaoranger by how he is able to return. Fuutaro draws suspicion when he recognizes Shirogane and stops a battle of Power Animals brought about by the control of Animal Tamer Org. (Quest 36-38)
- November 30th: After realizing humanity's errors in destroying their planet over the past millennium, Fuutaro briefly allies with the Orgs, but doesn't join them as he ultimately reveals himself as Gao God to the Gaoranger. Claiming humanity has no reason to be protected, he takes the Power Animals on the Animarium, turning it into a wasteland; however the team proving humanity's worth and Shirogane working to prove himself to the deity (as well as accessing the powerful Gao Hunter Blue Moon form) allows for him to reveal it all as a test and to continue to fight without his intervention. (Quest 39, 40)
- The Gaorangers defeat the Three Org Brothers with the help of GaoKong (The Movie)
- During an incident where Kakeru is tricked into thinking the Orgs wanted to be allies by "Christmas Org", he hands over his G-Phone to Rasetsu, who implants a bug within it. (Quest 41)
- Duke Org Dorodoro leads an invasion of Gao's Rock, ultimately using Tsuetsue to cut off her own horn in order to infiltrate and capture Tetomu in order for the shaman to cook for Rasetsu. When the Gaoranger try to attack to destroy the Duke and Rasetsu, Tsuetsue is used as a shield, killing her. (Quest 42)
- Tetomu tries to cook for Rasetsu meals devised by Tsuetsue, but is turned away due to the finicky Org's hatred of his former duke's meals. As she gets away, Dorodoro is defeated when he uses his "shadow clone" ability in accidentally creating a clone of himself, which the Gaoranger destroy. However after he's grown, he traps the team in another dimension, which they can't escape until Tetomu feeds her meal with her prayers in it to Gao Lion, making it grow huge and allowing for the formation of the Gao Centarus formation. (Quest 43)
- Rasetsu uses the bug implanted into Kakeru's G-Phone to track down Gao's Rock and attack it while disabling all other G-Phones. Growing after eating his tracker, he prepares to destroy the Gaoranger base until Tetomu succeeds in reaching the Animarium and summoning the Power Animals; they use the Gao Centarus formation to destroy the third Highness. (Quest 44)
- The effects of the special meal wear off, turning Gao Lion back to normal. (Quest 45)
- Hearing her voice from within Org Hell, Yabaiba uses Steam Engine Org in order to have the Gaoranger's Evil-Crushing Hundred-Beast Sword empower Tsuetsue's sliced-off horn to fish for her through Ura's mirror. He rescues her, but her mind has become obsessed with helping the three Highness Orgs, all of whom likewise revive through the effort. (Quest 46-48)
- The Gaoranger fight to try and stop the revived Highnesses, but the trio crush them, likewise revealing that there was no real Org Master; it was a figurehead that held the gate to the power source in Org Hell. Tetomu and Fuutaro go to the Org Matrix and finally shut down the gate to hell, allowing for the Gaoranger to destroy the Highnesses again; however in the meantime Tsuetsue used her new power as the "Org Witch" to create a new Org Heart, which she uses to fuse the three Highnesses to it and create their final form: Ultimate Org Senki. (Quest 49)
- Senki begins to massacre the Power Animals, killing Gao God and defeating Gao Hunter as he likewise destroy their Gao Crystals. Flying to the Animarium, he kills all of the Gaoranger's Power Animal allies before forcing the Animarium to crash to the ground and creates a corrosive rain to destroy the planet to make it suitable for Orgs. (Quest 50)
- Quest 50: The Hundred Beasts Die
Post-series
- 2001: The Seven Dark Spears with the assistance of Chubouzu, Chuuzubo's brother, defeat the Gaoranger and steal their G-Phones allowing them to use the power of the Power Animals themselves. With the assistance of the Hurricaneger and with Oogami returning to convince the Power Animals they're being deceived, the Gaoranger regain their powers and the two teams unite to defeat Chubouzu. (Hurricaneger vs. Gaoranger
- 2006: As one of the first 30 Super Sentai, Gao Red's Red Warrior spirit is inherited by AkaRed. (Boukenger vs. Super Sentai)
- 2011: The Gaorangers, among the first 34 Super Sentai, oppose an invasion of Earth by the Space Empire Zangyack in what becomes known the Legend War, ending with all Super Sentai sacrificing their power to destroy the invasion fleet. Dispersed throughout the universe, the powers ultimately resurface as Ranger Keys whilst the former Super Sentai disband. (Kaizoku Sentai Gokaiger ep. 1, 199 Hero Great Battle)
- 2012: A month following the defeat of the second Zangyack invasion, the powers of the 34 Super Sentai are returned to them by the Gokaigers. (Gokaiger ep. 51)
- 2012: The Gaorangers, among the first 34 Super Sentai, are apparently defeated by Tsukasa Kadoya (Kamen Rider Decade), Great Leader of Dai-Shocker which seeks to wipe out the Super Sentai, opposing Dai-Zangyack led by Emperor (formerly Captain) Marvelous (Gokai Red) who are hunting the Kamen Riders. Infact, all the presumed deceased Sentai and Riders had been transported to the dimensional rift, from which they emerge to defeat the new Shocker-Zangyack Alliance. (Super Hero Taisen)
- 2017: The Gaorangers, among the first 38 Super Sentai, provide their power for the Ninningers and Dai Megagers to defeat Gillmarda. (Zyuohger vs. Ninninger)
- 2019: The Gaorangers are embroiled in the Super Sentai Strongest Battle. (Super Sentai Strongest Battle)
- 2021: The Gaorangers, among the first 44 Super Sentai, are embroiled in the Zenkaigers' conflict with the Kikaitopia Jetsty Tojitendo. (Kikai Sentai Zenkaiger)
