For clarity, this article contains unmarked spoilers.
Post-Chrono Trigger future
- 1999 AD: Lavos awakens and is defeated by Crono's party.
- Darkness Beyond Time: Lavos, along with the post-1999 Lavos Timeline, is sent to the Darkness Beyond Time, a wastebasket for timelines nullified by time travel. There he finds Schala, who was sent there following the Ocean Palace incident where Lavos awakened in 12,000 BC and time displaced many in the Kingdom of Zeal. Schala is absorbed by Lavos, who begins mutating into the Time Devourer.
- 2300 AD: Belthasar arrives from the Ocean Palace incident, and instead of a Bad Future, finds a thriving futuristic metropolis. He manages to create Chronopolis, a facility to research time, in the Sea of Eden, where a splinter of Lavos known as the Frozen Flame is found and used to power the institute. Chronopolis is overseen by FATE, a supercomputer built out of the remains of Mother Brain.
- Belthasar discovers about the Time Devourer and its horrifying potential to destroy the entire universe. Likely with the help of FATE, Belthasar drew up an elaborate plan to create a device known as the Chrono Cross that could free Schala from the parasitic creature. While pinning down the specifics of Project Kid (possibly with help from correspondence with Lucca), Belthasar installed Robo as the Prometheus Circuit, a device intended to lock access to the Flame out if anyone were to touch it and become its Arbiter, and constructed the Neo Epoch, a time traveling machine he would use to watch his plan unfold.
- 2400 AD: Chronopolis attempts the Counter-Time Experiment, where through the Frozen Flame the facility could potentially have control over time itself. Instead, the result is the Time Crash, where the facility is exposed to the awakened Lavos from the Ocean Palace incident, who sucks them back 10,000 Years in the past.
Post-Time Crash past
- Pre-65 Million B.C.: Leah finds a time distortion that brings her to the present day Gaea's Navel.
- 9000 BC: Chronopolis arrives from the future in a sea that only contained one remote island, Gaea's Navel. To counterbalance, the entity brings in Dinopolis, from an Alternate Timeline where the Reptites evolved into the planet-connected Dragonians. Chronopolis attacks Dinopolis and wins, and FATE splits their nature-controlling machine known as the Dragon God (who is sent to the Darkness Beyond Time and absorbed by the Time Devourer). The six Dragons parts are split throughout the paradise FATE hoped to create through terraforming, the archipelago known as El Nido. The islands are inhabited by the Chronopolis staff who had their memories wiped clean, and the surviving Dragonians (who not only create the six Elements out of the powers from each Dragon, but also generate the Demihumans). To ensure total control, FATE surrounds El Nido with strong currents that prevents contact with the outside world and manipulates the populace through the Records of Fate.
- 920 AD: Zenan mainlanders discovered and colonized the area, establishing the town of Termina and dispersing throughout the isles. The Dragonians soon became extinct, and the cultural tradition of El Nido was pushed out to Marbule and Guldove. Viper Manor is built by the Viper Clan.
Post-Chrono Trigger present
- 1003 AD: Serge is born in Arni.
- 1004 AD: With the threat of her mind becoming dominantly hateful, Schala clones herself and sends the copy, Kid, to this year. She was found by Lucca and subsequently adopted. Lucca soon established an orphanage and brought in other children; she also continued her scientific research, attempting to perfect the construction of Time Eggs, one of whom was given to Kid.
- 1005 AD: Led by Dalton, Porre becomes a military potency and destroys Guardia. The Masamune is stolen and corrupted. When two Acacia Dragoons, Radius and Garai, find the sword, the former is driven insane and kills the latter. A guilt-ridden Radius buries his friend and the sword in what becomes the Isle of the Damned, before taking a spiritual path.
- 1006 AD: After Serge is mauled by a panther demon, his father Wazuki and Leena's father Miguel set out for Marbule to seek medical help. Serge's crying is heard by Schala, whose attempts at communicating create a storm that sends their boat off-course into a blacked-out Chronopolis. Wazuki brings Serge to the Flame. The boy is healed, but also becomes the Arbiter and subsequently locks the device out of FATE's access. Wazuki is corrupted by the Flame, and subsequently FATE manipulates his mind with the objective of killing Serge and restoring the connection. Miguel is captured by FATE and maintained prisoner. During the blackout, the Dragons manage to create a humanoid seventh one, Harle.
- 1010 AD: Wazuki attempts to drown his own son, an event that finishes his corruption and leads to his reshaping as Lynx.
Original Timeline (Another World)
- 1010 AD: Serge drowns.
- 1015 AD: Lynx and Harle set Lucca's orphanage on fire. Kid escapes and survives, swearing revenge. She becomes a thief in the process.
- 1016 AD: Radius comes to live in Hermit's Hideaway.
- 1017 AD: Belthasar arrives and becomes a researcher at Viper Manor. The Acacia Dragoons travel to the Isle of the Damned, where their leader Dario is corrupted by the Masamune and dies. His sword, the Einlanzer, is put on his grave.
- 1020 AD: At Belthasar's orders, Kid time travels to ten years prior.
Home World
- 1010 AD: Serge is saved by Kid. The paradox brings the future averted by Crono in which Lavos destroys the world back into existence, causing Chronopolis to cease to exist. The Dead Sea takes its place, and Another World's Miguel is sent to there to protect that dimension's version of the Frozen Flame. The Home Dimension's Records of Fate cannot transmit data as a result.
- 1016 AD: Radius becomes chief of Arni.
- 1017 AD: Dario barely survives and drifts to Forbidden Island, leaving his sword, the Einlanzer, behind in the Isle of the Damned. Most Acacia Dragoons travel to the Dead Sea and become frozen in time and partially phased out of existence standing before the vortex that leads to Miguel. The Masamune is planted by FATE outside the Dead Sea. Porre assumes control of El Nido.
- 1020 AD: While waiting for his girlfriend Leena in Opassa Beach, Serge passes out, dreaming of Kid.
Events of the game
- Serge awakens and discovers he's not in his world, but in another where he's dead. Visiting his own gravesite, Serge is attacked but saved by Kid.
- Serge's party infiltrates Viper Manor and speaks to Belthasar. Lynx attacks, and during their escape poisons Kid.
- Kid is saved by either Serge's extraction of Hydra Humour from Home World or the administering of it to Kid by Norris in Another World.
- Serge uses Kid's Astral Amulet to return to the Home World and take the Water Dragon's ice breath to freeze a volcano that stands before Another World's Fort Dragonia. There, Lynx uses the Dragon Tear to change bodies with Serge as a way to gain access back to the Flame. Kid is brainwashed by Dark Serge into serving him, while Serge in Lynx's body is sent to the Temporal Vortex, where he meets Sprigg.
- Sprigg and Harle release Serge into Home World. He's told to go to the Dead Sea, along the way retrieving the Einlanzer to break the seal created by the Masamune.
- In the Dead Sea, a chunk of an alternate future stuck in temporal stasis, Serge's party discovers about the Day of Lavos. Miguel is defeated, leading to the Dead Sea's destruction and restoring the dimensional distortion.
- Once they return to Another, they drive Porre's invading forces away, and as Dark Serge retreats for the Sea of Eden, Serge's party returns to Home. Once they discover that defeating the six dragons is required to get to the Sea of Eden, Harle leaves. After the dragons are defeated, Home's Dragon Tear is used in Fort Dragonia, and Serge gets his body back.
- In the Sea of Eden, Serge's party comes across Chronopolis and discovers about their temporal research that led into discovering alternate dimensions - including the game's "predecessor" Radical Dreamers. Once they arrive at the Frozen Flame's room, FATE destroys the Prometheus Circuit and tries to kill Serge, but is destroyed in the process.
- Now that nothing is guarding the Frozen Flame, the Dragon Gods unite and take it from Chronopolis, reforming Terra Tower in the process.
- Kid falls into a coma with nightmares of the orphanage's burning. Using the incomplete Time Egg in Kid's pendant, Serge travels back to the fire, saving many children in the process and comforting Kid's mind.
- The shards of the broken Dragon Tears are combined into a seventh element, the Chrono Cross.
- Serge's party strikes Terra Tower, defeating the Dragon God, named the TimeDevourer due to its being long-since devoured by the real Time Devourer.
- Serge's party is instructed by Belthasar to battle the Time Devourer. They head to Opassa Beach in Home World, where they consult with ghosts of Crono's party at Opassa Beach.
- Serge's party uses the Time Egg to enter the Darkness Beyond Time, also known as the Tesseract. Serge's party aligns the element song and uses the Chrono Cross. The Time Devourer is annihilated and Schala is freed. The dimensions merge back into a single dimension.
- Serge awakens in Opassa Beach again. Leena arrives, not understanding what Serge talks about Terra Tower, FATE, etc.
- Kid and Serge presumably marry in the future.
