During the moon landing, NASADA astronauts awaken Psycho Green.
Zordon and Alpha select Grace Sterling to lead a team of Rangers; Psycho Green is destroyed, but three Rangers die in battle. Grace will go on to found Promethea. (Perhaps not coincidentally, Promethea's city resembles Terra Venture.)
1986–1987 ("19 years" before "Scaredy Cat" / "20 years" before "Ranger Down")
In a magical dimension, Leanbow's team thwarts Morticon's plan to invade the human world. Daggeron and Callindor are sealed away. Bowen (son of Leanbow and Udonna) is taken to the human world, where he will be raised under the name Nick.
Udonna's sister Niella dies sealing the underworld; Leanbow is trapped as Koragg.
"Broken Spell, part 1" / "The Gatekeeper, part 1" (Leanbow, Niella)
"Scaredy Cat" (Jenji mentions things to do, "like sit in a cave for another 19 years")
"Long Ago" / "Ranger Down" / "Heir Apparent, part 1" (Daggeron vs. Callindor)
"Ranger Down" (Phineas left Bowen in the human world "20 years ago")
Ransik and a prison full of mutant criminals arrive from 3000. Four Time Force officers follow and recruit Wes (whose DNA is similar to Alex's) to unlock their Morphers. Wes moves into the clock tower with his teammates.
Frax synthesizes Trizirium crystals. The Raimei Destroyer fails, and the Time Shadow arrives from the future. (The Raimei Destroyer reportedly didn't exist without Ransik in 2001.)
Soon after joining the Silver Guardians, Eric claims the newly-unearthed Quantum Morpher.
Wes and Eric follow a mutant into prehistory and retrieve the Q-Rex.
Katie sees the ghost of Walter Brown and falls through a time hole. She wakes to find Walter's history has changed.
Jen arrests her rogue ex-partner, Steelix. Watching from 3000, Alex notes history is shifting.
Frax destroys Ransik's serum supply; Ransik raids Bio-Lab for more and critically injures Mr. Collins.
"Force from the Future" (Ransik chased by Time Force Rangers from 3000)
"Force from the Future, part 2" / "Something to Fight For" (Wes recruited)
"Ransik Lives" / "A Parting of Ways" (clock tower)
"The Time Shadow" (Trizirium crystals, Raimei, Time Shadow)
Alex arrives from 3000 and takes Wes's place as Red Ranger, telling him of his fate (leftabove); Wes instead leads the Rangers to victory against Dragontron. Inspired, Alex revives Mr. Collins and returns to the future.
The Lightspeed Rangers help against Vypra. Joel and Ms. Fairweather are newlyweds.
Accessing history banks from 3000, Circuit foresees the destruction of Silver Hills by time holes (below).
Wes convinces Bio-Lab to halt the anachronistic production of Trizirium crystals.
"Dawn of Destiny" / "Fight Against Fate" / "Destiny Defeated" (Dragontron, Alex, Mr. Collins)
Space Patrol Delta (SPD) spans the galaxy, having started on the planet Sirius.
Sirius at some point falls to Emperor Gruumm. Having survived, Doggie Cruger will later lead SPD's Earth branch.
As Kat Manx experiments with Ranger technology, her human assistants accidentally acquire altered DNA and begin to sire metahuman children. Among them, young Z will be shunned, and Jack (his parents reportedly missionaries) will live on the streets. Born into wealth, Syd will become a cover girl with her own pop album.
"Beginnings" (Jack on the streets)
"Beginnings" / "Idol" / "Shadow, part 1" (SPD origins)
"Confronted" / "Samurai" (Syd the cover girl)
"Dogged" / "Stakeout" (Syd's family)
"Sam, part 2" (SPD pioneers in 2001, metahuman children, missionaries)
Two months after Danny's arrival (above), Cole completes the Wild Force team as the Red Ranger.
Zen-Aku is freed; once restored to human form, Merrick becomes the Lunar Wolf Ranger.
Jen tracks Mut-Orgs from 3001; the Wild Force Rangers ally with Wes and Eric. The other Time Force Rangers bring Ransik and Nadira from the future. Ransik's mutant DNA is nullified in battle.
Bulk and Skull have reunited; Bulk runs a resort (which Tommy visits).
Remnants of the Machine Empire dig up Serpentera on the moon. Hearing the news from Andros, Tommy gathers additional Red Rangers, and Serpentera is destroyed. (Red Rangers include Jason, Aurico of the Alien Rangers, Zeo Tommy, Turbo T.J., Andros, Leo, Carter, Wes, Eric, and Cole.)
Master Org is destroyed. Shayla returns to the sky with the Wildzords.
"Curse of the Wolf" (Zen-Aku released)
"The Ancient Warrior" (Merrick restored)
"The Lone Wolf" (Lunar Wolf Ranger)
"Reinforcements from the Future" (Mut-Orgs, Ransik, year 2002)
"Forever Red" (Bulk and Skull, Tommy, Red Rangers)
"The End of the Power Rangers" (Master Org destroyed)
Venjix year 1 ("3 years" before start of "The Road to Corinth")
Some time after celebrating her 14th birthday with Gem and Gemma, Dr. K discovers she isn't "allergic to sunlight."
Dr. K unveils Project Venjix, a computer virus designed to help her escape with Gem and Gemma (she has also been using it to help with Project Ranger). K is seized before she can install a firewall, and Venjix is unleashed on the alternate Earth.
Within a year, the virus will have infected 37% of this world's computer systems.
Moltor and Flurious arrive on Earth. Mack joins Andrew Hartford's recruits as an Overdrive Ranger. Moltor steals the crown of the Corona Aurora.
Previously transformed into a reptilian form by Moltor, Tyzonn eventually returns to normal and becomes the Mercury Ranger.
Thrax and crew damage a portion of the Morphing Grid. The Sentinel Knight re-powers veteran Rangers Adam, Tori, Kira, Xander, and future Bridge. Alpha 6 repairs the Morphing Grid, and Thrax is destroyed.
Mack is revealed as a robot.
Flurious destroys Moltor and assembles the Corona Aurora. Mack sacrifices himself to destroy Flurious; Sentinel Knight revives him as a human.
"Kick into Overdrive, part 1" (six months pass, Moltor and Flurious arrive, Overdrive Rangers debut)
"Kick into Overdrive, part 2" (Moltor steals crown)
"Face to Face" / "Man of Mercury" (Tyzonn, Mercury Ranger)
"Once a Ranger" (Thrax, Sentinel Knight's team, Alpha 6)
"Ronny on Empty" (Halloween)
"Things Not Said" (Mack revealed)
"Nothing to Lose" (Moltor's demise)
"Crown and Punishment" (Flurious destroyed, Mack reborn)
The Jungle Fury Rangers may battle Dai Shi's forces.
Venjix year 4 (est.)
In the RPM dimension, Venjix seizes the world’s communication, power, and defense systems as his robot armies begin a surprise offensive against humanity. This war will ultimately leave this Earth in a "post-apocalyptic" state.
As Alphabet Soup is hit by Venjix's air strikes, Dr. K records a message urging people to take shelter in Corinth, where she ultimately arrives with a case of Ranger-tech.
Having escaped Alphabet Soup with gold and silver Morphers, Gem and Gemma will wage a two-person war against Venjix's forces (spending some time in captivity).
The exodus to Corinth includes Flynn and his dad (from Scotland), Summer (whose butler dies on the way), and Ziggy (who seeks to join the Scorpion Cartel).
"The Road to Corinth" (summary of attacks)
"Ranger Green" (Ziggy and Scorpion Cartel)
"Ranger Red" / "Ranger Yellow, part 1" / "Ranger Blue" (attacks quick and unexpected)
"Ranger Yellow" (Summer and butler)
"Ranger Blue" (Flynn and dad)
"Doctor K" (Dr. K's escape)
"Embodied" / "Ghosts" ("post-apocalyptic")
"Embodied" / "Ghosts" / "In or Out" (Gem and Gemma's survival)
"In or Out" (Gem and Gemma's war)
"In or Out" / "Belly of the Beast" (Corinth said to be last human city on Earth)
"Prisoners" (Gem and Gemma's time in captivity)
Samurai: "Clash of the Red Rangers" (alternate dimension)
Hyper Force episode 6 (Corinth evacuation in 2009)
At some point, General Kilobyte supervises a Venjix project which turns a number of humans into unwitting robot hybrids; among them are Cpl. Hicks and a brother-sister pair later named Dillon and Tenaya (Tenaya has previously met Gem and Gemma, leftabove, in captivity).
Dillon somehow escapes Venjix's facility; his memories damaged, he will roam the wasteland looking for someone he doesn't clearly remember.
Kilobyte also ends up lost in the wasteland through unknown circumstances (but see rightbelow).
"The Road to Corinth" / "Rain" (Dillon's search)
"Fade to Black" / "Heroes Among Us" / "End Game" (hybrids)
"Rain" / "Blitz" / "Heroes Among Us" / "Key to the Past" (Dillon and sister turned into hybrids)
During an air battle over Corinth, Scott ejects as his plane is destroyed, but his brother dies. The next day, Col. Truman prepares to raise the shields (per his plan to somehow "outlast" Venjix).
Flynn borrows a bus to bring stragglers into Corinth, and Summer uses a bike to retrieve Scott just as the shields go up. Summer will later postpone an arranged marriage and live among the "normal people" in Corinth.
Scott, Summer, and Flynn will eventually be chosen for Dr. K's Ranger program.
"The Road to Corinth" (Battle of Corinth)
"The Road to Corinth" / "Ranger Blue" (Flynn)
"Rain" (Ranger program, rigorous requirements)
"Ranger Red" (Scott and brother, air battle)
"Ranger Yellow" (Summer's arranged marriage)
"The Road to Corinth" / "Ranger Red" / "Ranger Yellow, part 2" (Summer's rescue)
"Embodied" (plan to "outlast" Venjix)
Samurai: "Clash of the Red Rangers" (alternate dimension)
Vrak goes into hiding as his brother Prince Vekar arrives with an Armada fleet. The Super Mega Rangers use Ranger Keys to harness the powers of past Ranger teams (some never before seen on Earth).
After unlocking SPD and Mystic Force Zords, the Rangers find the Animarium and ally with the Red Lion. Jayden and Casey provide additional support.
Orion arrives on Earth, unlocking the Sixth Ranger keys (and a Q-Rex Zord apparently from the future).
The Rangers retrieve a Zord from Corinth, which has been "at peace for a long time." Professor Cog is defeated again.
Following Vekar's death, Robo Knight gives his life force to Orion, and Vrak is destroyed.
Emperor Mavro perishes during a full-scale invasion of Earth. In a "Legendary Battle," past Ranger teams help the Mega Rangers finish off the Armada's ground forces. (This battle includes all teams for which a prior season was named, including the Alien Rangers. No explanation is offered for the presence of Turbo, Time Force, SPD, or RPM.)
"End Game" (Vrak hides)
"End Game" / "Super Megaforce" (Armada arrives)
"Super Megaforce" (Super Mega Rangers, new school year)
In the Dino Charge dimension, Sledge returns to Earth. (This is the Sledge whose ship was crippled by Keeper's explosion.) Tyler, Shelby, and Riley join the Dino Charge team after bonding with Energems.
The gold Energem breaks Fury's hold over Ivan, who becomes the Gold Ranger. Prince Philllip bonds with the graphite Energem. Albert surrenders the purple Energem, which later bonds with Ms. Morgan.
Sledge disappears after his ship crashes. Weeks later, Heckyl takes command of Sledge's forces.
No longer aging due to his Energem, James resurfaces as the Aqua Ranger.
Lord Arcanon arrives. Zenowing is split from his evil half, as is Heckyl from Snide. Sledge destroys Arcanon.
As the Rangers claim the Dark Energem, Sledge pulls the Earth out of orbit. Keeper directs the Rangers to destroy the Dark Energem in space, but this opens a black hole (or wormhole) which swallows Sledge's ship and the Earth itself. The Rangers travel back to prehistory.
"Powers from the Past" (Tyler and Shelby's Energems)
"Past, Present and Fusion" (Riley's Energem)
"Past, Present and Fusion" / "No Matter How You Slice It" / "One More Energem" (Riley is away from home only for the summer)
"A Fool's Hour" (Sledge's arrival)
"Double Ranger, Double Danger" (date given as June 10)
"Break Out" (Gold Ranger)
"Rise of a Ranger" (Graphite Ranger)
"World Famous (in New Zealand)" (Albert)
"One More Energem" (Ms. Morgan becomes Purple Ranger, Sledge's ship crashes)
"The Ghostest with the Mostest" (Halloween special, ignored)
"Race to Rescue Christmas" (Christmas special, ignored)
Katana visits from the past; as he returns home, the Omega Ranger (future Sam) arrives from 2040.
On July 11, Boom picks up an ominous broadcast from 2040, but once Omega wins a pivotal battle, Boom hears future elevator music instead. (That's supposed to be good news.)
Broodwing obtains the Dino Gems and summons the Dino teens from 2005. Their powers restored by Kat, the Dino Rangers team with SPD and are returned with no memories. (Their recharged gems disappear at the same time.)
Gruumm and Mora briefly visit 2004, the SPD Rangers in pursuit.
Gruumm and his crew are defeated and confined. Nova Ranger escorts Sam back to the (revised?) future. Jack retires; Sky and Bridge change colors (unknown Green), and the rank of A-Squad is retired.
At some point, Doggie is promoted to supreme commander of SPD, with Sky replacing him as head of SPD Earth; Bridge becomes Red Ranger (unknown Blue and Green) and will go back in time to help the Overdrive Rangers.
Some group of SPD Rangers (whether time-traveling or not) participates in the Legendary Battle in the past.
"Samurai" (Katana, Omega arrives)
"Messenger" (Omega Ranger debuts, 2040)
"History" (Dino Rangers to 2025)
"Wormhole" (Gruumm to 2004)
"Endings, part 1" (A-Squad, Broodwing, and generals confined)
"Endings, part 2" (Nova Ranger, Gruumm confined, Jack retires)
Operation Overdrive: "Once a Ranger" (additional promotions, Bridge goes back in time)
Super Megaforce: "Legendary Battle" (Legendary Battle)
The Time Force Police arrest most of Ransik's gang. Alex provides support as the Red Time Force Ranger, while four other Morphers remain unused. (The Rangers' resemblance to the suit worn by Sky's father may or may not be coincidental.)
Alex coaches (and becomes romantically involved with) cadet Jen. After being partnered briefly with Steelix, Jen partners with Alex.
"Force from the Future, part 1" (lone Alex, other Morphers in storage, Jen and Alex a couple)
"Jen's Revenge" (Jen and Alex partners, arrest Fatcatfish)
Still alive (see above), Alex serves as the mysterious head of Time Force. (Was this always true or a result of changes to history?)
Alex monitors the concurrently unfolding events of 2001 and eventually sends the Time Shadow to help.
As Frax prepares Dragontron in the past, Alex grows concerned with deviations from the history banks and travels back to intervene. He returns after healing Mr. Collins on his deathbed. (The impact of this change is unknown.)
Alex later blocks Circuit's remote access to the history banks as a time hole crisis looms in the past. Alex rescues his team with a Timeship (they died originally), but upon learning of Wes's death in the past, the team goes back to save the day. They return to the future with Ransik in custody.
"The Time Shadow" (Alex monitors past, sends Time Shadow)
"Time Force Traitor" (Alex concerned, outranks Captain Logan?)
"Dawn of Destiny" (Alex to 2001)
"Destiny Defeated" (Alex changes history, returns to 3000)
"Circuit Unsure" (Circuit's access blocked, impact of alternate Collins family history apparently minimal)
"The End of Time, part 1" (Alex sends timeship to rescue four officers)
"The End of Time, part 2" (four arrive, refuse memory adaptation)
"The End of Time, part 3" (Rangers return with Ransik)
Wild Force: "Reinforcements from the Future, part 1" (impact of Silver Hills' survival apparently minimal)