[[caption-width-right:350:[[http://www.youtube.com/watch?v=MfPx75NV-Pk Stronger than before!]]]]

%%The Bumblebee is not part of the Five Man Band. Do not remove%%
->''"It's Morphin' Time!"''[[note]]Followed by "Zeo Ranger (number), (color)!" for the five main Zeo Rangers, and "Gold Ranger Power!" for the [[SixthRanger Zeo Gold Ranger]][[/note]]
-->--'''[[ByThePowerOfGreyskull Morphing call]]''', ''Power Rangers Zeo''

->''[-"[[EtherealChoir Gooooooooooo Zeeeeeeeoooooo....]]"-]''

The fourth season of ''Franchise/PowerRangers''; a follow up to ''Series/MightyMorphinPowerRangers'', adapted from ''Series/ChourikiSentaiOhranger''. Rita and Zedd have been reduced to homeless rovers on what was once their moon kingdom due to the invading Machine Empire, who want to gut Earth of its natural resources. The Rangers are briefly left powerless after the destruction of their command center. But thankfully, Zordon reveals that he and Alpha have tapped into the mighty Zeo Crystal and they have produced brand new ranger powers, including for the first time brand spankin' new uniforms for the ''entire'' team.

''Zeo'' is largely where the franchise began to grow up, by introducing a few season-spanning plot threads, becoming ''slightly'' less preachy, with charity work a less common plot element, and much more character-driven. Billy, the last original Power Ranger retired from active duty to act in a tech support and MissionControl role, as well as serving as a mentor to the newer rangers under Zordon. Newer characters such as Katherine and Tanya, and even Rocky and Adam, were allowed to grow beyond their SuspiciouslySimilarSubstitute beginnings. Even Bulk and Skull managed some CharacterDevelopment after going through police training and later becoming private detectives. The show also reintroduced Jason, the original Red Ranger, to return and take up the role of their SixthRanger.

Zedd and Rita were also not quite out of the picture, as they worked to reclaim their status as the series villains and sometimes their guerrilla strikes against the Machine Empire ended up helping the Rangers. It is one of the more popular seasons, as it had classic characters, an epic scope ''and'' decent writing. It also set up the concept of the Ranger changing powers and costumes once a year. It's still not without its problems. One of the biggest criticisms is that it doesn't really have any conclusive ending; the series ends with Jason giving up the Gold Ranger powers and the Machine Empire crippled (but not entirely destroyed) with Lord Zedd declaring "We're back!" and plotting their full return. It goes on straight to the ''[[Series/PowerRangersTurbo Turbo]]'' movie, where Lord Zedd and Rita are mostly irrelevant to the plot and the Zeo powers are suddenly useless.

The infamous fan hoax ''Scorpion Rain'' was an attempt to bridge this gap, which was then retroactively placed into continuity years later, by being the setup for the events in the [[MilestoneCelebration ten-year anniversary]] episode "Forever Red". Basically the story involved Rita and Zedd fighting against the Machine Empire including Zedd's Zord Serpentera, and climaxing with a royal rumble on the moon. Several Fanedits have been made of this "episode", all of which could be found on Youtube, until Saban's copyright banhammers put an end to that. To date, only the original "Scorpion Rain" video produced in the 90s remains active on the site.

The official WordOfGod, given years later, says that Rita and Zedd had taken off for a belated honeymoon and Rita's ensuing maternity leave. Other than the child inexplicably appearing [[Series/PowerRangersOperationOverdrive years later]], there was no in-series hint of why they suddenly disappeared after this season. Though since the season ended rather coherently much of this can be blamed on ''Turbo'' for its ''lack'' of series continuity.

This season is also infamous for the DearJohnLetter that Kimberly sent to Tommy in "No Business Like Snow Business". Despite this, however, ''Zeo'' is generally considered by fans to be a very good season, with good writing, more fleshed out characterization, and a pretty good storyline. Some also consider it to be in some ways better than the original seasons in terms of quality, especially since it made a dramatic shift in costumes and setting; in other words, ''Zeo'' had some big shoes to fill, and they were filled well.

Unfortunately ratings that had begun to decline in season 3 dropped even further in Zeo, leading to Turbo dropping several plot points and hastily transitioning to the Turbo powers with barely an explanation.
!!Recurring ''Power Rangers'' tropes include:

* AdvertisingCampaigns: The most memorable of which featuring "...you gotta see it... it's coming... you gotta see it... [[http://www.youtube.com/watch?v=AKal35GJ5_A unleashing the POW-AAAAAH...]]" set to a [[RearrangeTheSong variant]] of the theme tune. The full song, nicknamed "[[http://www.youtube.com/watch?v=QVmT0qp1OdY Unleashing the Power]]," circulates around the Internet.
* AttackOfThe50FootWhatever: Besides the usual monster attacks, the season finale "Good as Gold" sees the Rangers grow in size in order to combat King Mondo. Sure they could've used their zords, but Trey said there was no time for that. Yeah, right.
* BigBad: King Mondo
* ChestInsignia: Personal geometric shapes on the helmet visors, team emblems on the belts.
** BilingualBonus: The Gold Ranger's visor is the kanji for "King," as his ''Ohranger'' counterpart was named King Ranger.
* CityOfAdventure: Angel Grove
* FiveManBand: Naturally.
** TheHero: Tommy
** TheLancer: Rocky
** TheSmartGirl: Kat
** TheBigGuy: Adam
** TheChick: Tanya
** MysteriousProtector: Trey
** SixthRanger Jason
* HomeBase: The Power Chamber, beneath the site of the old Command Center.
** ElaborateUndergroundBase
* HumongousMecha
** CombiningMecha
** TransformingMecha: the Warrior Wheel and Pyramidas.
* ItRunsOnNonsensoleum
* LawOfChromaticSuperiority: Tommy got his own Zord (the Red Battlezord) and was the primary pilot of the Defender Wheel (though Rocky got to use it once.)
* MadeOfExplodium
* MakeMyMonsterGrow: Lifted directly from its source material, this is Clank and Orbus' reason for living.
** In an interesting variation, the FinalBattle sees [[spoiler:Trey make the ''Rangers'' and himself grow to fight King Mondo and his giant Cogs.]]
* {{Mooks}}: Cogs
** {{Giant Mook}}s: The series first example. In "Good As Gold" King Mondo grows and has a group of Cogs grow with him.
** {{Lampshaded}} in Episode when one uses "Mook" as a password
* RecycledInSpace: Averted. Production took the ancient world cultures theme from ''Series/ChourikiSentaiOhranger'' and downplayed them so that things were kept as generic as possible - so stuff was recycled, but not [[foldercontrol]]

[[folder: IN SPACE ]]
* {{Thememobile}}/CoolBike: Zeo Jet Cycles
* WeaponOfChoice:
** SwordAndGun: Zeo Blades and Laser Pistols
** HeroesPreferSwords: Tommy's Zeo Sword
** DualTonfas: Rocky's Zeo Bladed Tonfas
** AnAxeToGrind: Adam's Zeo Hatchets
** FightingWithChucks: Tanya's Zeo Dual Nunchuks
** LuckilyMyShieldWillProtectMe: Kat's Zeo Shield (possibly also DeadlyDisc)
** {{BFG}}: Zeo Cannon
** SimpleStaff: Gold Ranger's Golden Power Staff
*** BoomStick: its Gold Rush attack
* WordPower:
** ByThePowerOfGraySkull and/or {{Invocation}}: "It's Morphin' Time!"
-->'''Kat:''' [[color:fuchsia:"Zeo Ranger 1 - Pink!"]]\\
'''Tanya:''' [[color:gold:"Zeo Ranger 2 - Yellow!"]]\\
'''Rocky:''' [[color:blue:"Zeo Ranger 3 - Blue!"]]\\
'''Adam:''' [[color:green:"Zeo Ranger 4 - Green!"]]\\
'''Tommy:''' [[color:red:"Zeo Ranger 5 - Red!"]]\\
'''Jason:''' [[color:goldenrod:"Gold Ranger Power!"]]

!!This subseries contains examples of:

* TheAce: Kat. She dives, dances, sings, surfs, skis, trains dogs, trains ''monkeys''... it's finally tossed a [[LampshadeHanging lampshade]] when her friends tease her for moping because the purse she made was so ugly. "C'mon, there had to be ''something'' you're not good at."
* AdvertisingOnlyContinuity: A commercial gave the villain's name as Queen Machina instead of her husband, King Mondo, and had them operating out of the original command center when they were actually operating in the underground Power Chamber.
* ArcWelding: The Red Battlezord is said to derive technology from the Alien Rangers' Battle Borgs.
* TheArtifact: The acronym U.A.O.H. shows up a few times during the season most notably on the floor of the Zeo Zord Hangar. This is an artifact from Ohranger, and it stands for for "United Airforce Overtech Hardware", which was the military organization the Sentai team worked for.
* BadassBoast: At the end of "King for a Day, Part 2", Jason delivers one to Gasket:
-->"You mess with one Ranger, you better be willing to take on the whole team!"
* BadassNative: Tommy. David too.
* BifurcatedWeapon: The Super Zeo Megazord has twin swords that can be combined into a [[{{BFS}} large saber]] for destroying monsters.
* BrainwashedAndCrazy: Tommy. [[RunningGag Again]]. This is the fourth or fifth time.
* BrokenAesop: Possibly. Zedd and Rita send the Impurseinator monster - it almost beats the rangers. The Machine Empire sends the Cog Master - it almost defeats the rangers. The Aquitarian rangers come in and help. The rangers all talk about how great teamwork is and how much it's helping them. The enemies decide to have teamwork and combine the two monsters. The rangers defeat the monsters, because somehow individually they were far stronger when the enemies worked independently - teamwork is great if you're good, but villains seeing eye to eye equals total failure?
* TheBusCameBack: Jason returned to take on the mantle of the Gold Ranger halfway through the season.
** Ditto for Zedd, Rita and Finster.
* CassandraTruth: After Bulk and Skull's adventure in "King For A Day", they tried to convince everyone that they helped save the rangers. No one believes them except the rangers themselves, but Bulk and Skull think they're just giving them pity.
* TheCastShowOff: Besides the obvious martial arts, Kat's ballet dancing and Tanya's singing.
* CharacterizationMarchesOn: Adam, Kat and especially Rocky. In MMPR, the replacements were [[SuspiciouslySimilarSubstitute Suspiciously Similar Substitutes]] who were sort of just....there to fill in spots left behind by better rangers. But now that they were original members of their own team, there was more room for them to grow as characters. Don't be mistaken, the show was still all about Tommy and their personalities were still relatively bland and undefined compared to the originals but at least now they didn't feel like just mere replacements.
* CliffhangerCopout: In "A Zeo Beginning", Alpha's solemn final line at the end of Part I suggests that something happened to Zordon in the Command Center's implosion. This line doesn't make it to the beginning of Part II, where Alpha instead cheerfully reveals that Zordon is just fine.
** Oddly enough, the VHS release of the episode (which had the two parter, along with only the Zeo Crsytal search in MMAR spliced together in movie format) kept Alpha's somber dialogue even with Zordon's well being immediately shown.
** Also, the third season of Mighty Morphin' ended with the Zeo Crystal being stolen. In "A Zeo Beginning" the rangers find the crystal buried amidst the rubble of the command center, speculating that [[TooDumbToLive Rito and Goldar dropped it]].
* CluelessMystery: The identity of the Gold Ranger, with all the existing characters turning out to be {{Red Herring}}s.
* ComicBookAdaptation: A planned series by Image Comics based on the show was slated, but only one issue managed to be released, which ended on a pretty big cliffhanger[[note]]The first (and only) issue ends with the Machine Empire now in possession of the old Dino Coin energies after Master Vile gave it to them.[[/note]].
* ConservationOfNinjitsu: In one episode the Rangers went up against several hundred Cogs and just tore through them. A few episodes later, a half-dozen were able to hold them back.
* ContinuityNod: In "Good as Gold", Rita says this to Jason:
-->"Personally, I always thought you looked better in [[Series/MightyMorphinPowerRangers red]]."
* CriminalAmnesiac: Tommy in "King For A Day".
* DangerouslyGenreSavvy: Of all characters, Prince Sprocket. He became well aware of the scenario of "monster grows, rangers fight it, monster is destroyed". He even used it in attempt to get rid of his brother by getting him to grow. Unfortunately, his plan didn't work as his brother managed to survive the fight.
* ADayInTheLimelight: Bulk and Skull in "Bulk Fiction" and "Scent of a Weasel".
* DecompositeCharacter: The two bodies of Prince Buldont from ''Ohranger'' become two separate characters (Prince Sprocket and Prince Gasket).
* DeliberatelyMonochrome: Used in "It Came From Angel Grove", as a nod to old horror films.
* DemotedToExtra: Billy, but even as not a Ranger, he still had an important (and still rather large) role. Rocky also suffered a little from this, which is acknowledged in "Mondo's Last Stand" when he was convinced that the returning Jason was out to replace him.
* DidYouJustPunchOutCthulhu: After years of being largely irrelevant, Rita creates a monster out of Kat's purse. In 1v1 combat, it beats the zords. All of them. Even the Ultrazord, twice.
* DroppedGlasses: Happens to Billy with his contacts in "Graduation Blues". It's a good thing he still kept his old glasses.
* EvilVersusEvil: Rita and Zedd spend most of the season fighting the Machine Empire
* FamilyUnfriendlyDeath: A rather nasty, MechaMooks loophole exploiting death where [[EvilVersusEvil two groups of enemy mooks have a battle royale]]. The mooks are Tengas (bird men) and Cogs (spandex robots) You see Tengas and Cogs sluggin it out for a few shots, then it cuts to one Tenga holding down a struggling Cog while another Tenga ''tore open its stomach and ripped out its electronic guts.'' This wasn't ''Series/ChourikiSentaiOhranger'' footage that slipped past the censors, either - Tengas were ''Power Rangers''-exclusive mooks, so it was all original footage.
** Oh my goodness, ''Zeo''. Louie Kaboom, the temporary leader of the Machine Empire. Under a [[MoreThanMindControl love spell]] cast by the new villains he takes on the Rangers in combat, and is eventually defeated. However, unlike most of the mindless minions that fell to the Rangers, he remained alive for a few moments, ''stumbling around in pain while on fire and professing his love for the villain that brainwashed him.''
* {{Fanservice}}: Jason modeling in the fashion show in "Scent of the Weasel" and wearing red.
* FiveTokenBand: Tommy (Native American), Adam (Asian), Rocky (Hispanic), Tanya (African), and Kat (Caucasian, from Australia).
* [[FourTemperamentEnsemble Five Temperament Ensemble]]
** Tommy: '''[[color:green:Phlegmatic II]]'''
** Tanya: '''[[color:yellow:Choleric]]'''
** Kat: '''[[color:blue:Leukine]]'''
** Adam: '''[[color:black:Melancholic]]'''
** Rocky: '''[[color:red:Sanguine]]'''
* FixFic: With one well remembered couple throughout the seasons (Tommy/Kim), which ended because of a DearJohnLetter sent by Kimberly, there are plenty of fics reuniting them that claimed it was a fake (the person responsible usually being Kat), or that Kim was hiding the real reason for the breakup.
* GenreSavvy: In "King for a Day, Part 2," Zedd and company enjoy seeing Jason forced to fight a brainwashed Tommy. However, Zedd is smart enough to know right away that the Machine Empire defeating the Power Rangers won't do any of them any good. Much to his displeasure, he knows the only way to retain a chance of conquering Earth someday is to ''help the Power Rangers''.
* GirlOfTheWeek: Rocky had a couple…
** Bulk and Skull had one a piece, surprisingly enough, that ''weren't'' the ranger ladies. Bulk's came in as the daughter of the police captain and Skull's was a '''SUPERMODEL''' of all things.
* GroundhogDayLoop: "A Brief Mystery of Time".
* HappyFunBall: The Midas Hound in "The Ranger Who Came In From The Gold".
* HeroicBSOD: Rocky goes through one in "Mondo's Last Stand" when he thinks he's being replaced by Jason. [[spoiler:After they defeat King Mondo, Rocky manages to get over it after Jason reassures him that he isn't trying to take his place.]]
* HiddenDepths: Skull is revealed to be a talented piano player, but doesn't want Bulk to find out because he thinks he'll lose macho cred. Adam convinces him to give a performance... And Bulk is genuinely amazed. Aww.
** The former (possibly) gets a little more when he talks with a model he accidentally spilled a rancid smelling perfume all over. The chemistry between them seemed quite good, even though she was [[NoNameGiven never named]] [[OneShotCharacter nor ever seen again]].
* HilariousOuttakes
* HollywoodToneDeaf: Averted in "Another Song and Dance" with Tommy, who is just a genuinely bad singer.
* HurricaneOfPuns: Rocky, when he's turning into a plant in "A Few Bad Seeds", which also involves some GettingCrapPastTheRadar when he makes some fairly suggestive comments towards Kat.
* IKnowYouAreInThereSomewhereFight: Brainwashed Tommy vs. the others in "King For A Day".
** CooldownHug: From [[ShipTease Kat]].
* ImprovFu: Occurred with Bulk and Skull when they were accidentally sent to a coliseum in another world and they get saved by another warrior, they have to face down a few guards and ultimately, they were able to take them down with the power of bumbling around.
* IncredibleShrinkingMan: Tommy and Kat in "A Small Problem".
* InterimVillain: Prince Gasket
* InterspeciesRomance: Billy and Cestria, an Aquitian.
* IWantMyBelovedToBeHappy: Kat has been in love with Tommy since her first appearance way back in season three of ''Mighty Morphin Power Rangers'', but when Kimberly breaks up with him, she does everything she can to cheer him up including setting him up on a date with another woman.
-->'''Kat:''' I'm not sure if that was really nice or ''really'' stupid...
* LeaningOnTheFourthWall: also a ContinuityNod:
-->'''Klank:''' Zedd and Rita have just made a monster from a pink purse, your Highness.
-->'''Sprocket:''' A purse monster? That's so [[Series/MightyMorphinPowerRangers last season]].
* LethalJokeCharacter: The aforementioned purse monster, Impursenator. As stated before, she was a monster made out of Kat's fugly purse, and managed to almost defeat the Rangers without even really trying. They used almost every possible strategy of zords, upgrades, combinations and formations (BOTH SETUPS for the Zeo Ultrazord) and only managed to escape when a) the Machines teleported Impursenator away [[TheOnlyOneAllowedToDefeatYou out of jealousy]] and b) she merged with the Machines' monster and somehow [[AnticlimaxBoss this made them both sucky.]]
* LiteralSplitPersonality: Trey; a natural ability for Triforians like him.
* MagicalNativeAmerican[=/=]LongLostRelative: David Trueheart.
* MakeWayForTheNewVillains: The arrival of the Machine Empire sends Rita and Zedd running.
* [[MakingUseOfTheTwin Making Use of the Triplet]]: Trey again.
* MarriedInTheFuture: The Christmas-themed episode, "A Season to Remember", involved a flash forward showing Tommy and Kat being married. Some shippers were not [[DieForOurShip accepting of this development]] and [[FanonDiscontinuity tend to ignore it]]. In fact, Catherine Sutherland (Kat's actor) has verified that she was in talks to appear in both [[Series/PowerRangersWildForce Wild Force's]] "[[MilestoneCelebration Forever Red]]" and [[Series/PowerRangersDinoThunder Dino Thunder]] as Mrs. Oliver (the former was scrapped during rewrites while the latter fell through due to Sutherland's pregnancy at the time).
* MusicalEpisode: Parodied in "Another Song and Dance".
* MythologyGag: The episode where Louie Kaboom shows up is called "Bomber in the Summer"- a nod to his Ohranger name Bomber the Great.
* NonActionGuy: Billy becomes one of these.
* NotAfraidOfYouAnymore: In the final episode, Rita tells Mondo she and Zedd didn't fear him any longer. And yet, [[spoiler:Zedd pretended otherwise to trick the Machine Empire]].
* OhCrap: The monster Cruel Chrome mutters "This can't be good" as he sees the Super Zeo Ultrazord looming over him. (actually, most of the monsters feel this way about the Zeo Ultrazord / Super Zeo Ultrazord - they see the Megazord loom over them as it's apparently far taller then a standard Megazord and know it's a bad sign.)
* OfficialCouple: Tommy/Kim was a carryover from [[Series/MightyMorphinPowerRangers Mighty Morphin]] until she dropped a Dear John Letter midseason. Tommy/Kat begun shortly afterwards.
* TheOnlyOneAllowedToDefeatYou: By the end of the season, both Rita and Mondo display this attitude towards the Rangers.
-->'''Mondo:''' The final defeat of those putrid Power Rangers is ''mine'' and mine alone!\\
'''Rita:''' That tub of rebuilt parts isn't grabbing my glory!
** Notably, Zedd of all people is a subversion. He'd gladly destroy the Rangers himself, but as he asks, "Who cares ''who'' destroys those Ranger brats?"
* ParentalBonus: The target audience for Power Rangers is 6-11 which means that if their parents were between 20 and 30 they would be born between 1954 and 1970, which means the majority would have been alive for the third moon landing in 1971, meaning they would likely remember the golf ball(s) Alan Shepard left there. Why does this matter you ask? Well Rito finds one ~3 minutes into "The Joke's on Blue". Also qualifies as a GeniusBonus for the kids smart enough to know that too.
* PieInTheFace: A group of Cogs is defeated this way, and it's hilarious.
* PlotRelevantAgeUp: Billy in "Rangers of Two Worlds".
* PreMortemOneLiner: Shortly before blowing Admiral Abominator the f*ck up with the Zeo Mega Battlezord, Tommy delivers the line "Time for you to weigh anchor, Admiral!"
* PutOnABus: When the Machine Empire came in at the start of the season, the old villains beat a hasty retreat on Serpentera to Master Vile's (in Zedd's case, this was clearly PutOnABusToHell). Half a season later, Zedd, Rita and Finster came back, but without Squatt and Baboo.
* RealLifeWritesThePlot: Billy's abrupt departure, which used an aged-up TheOtherDarrin and stock footage, came about when David Yost walked off the set after the creators, producers, writers, and directors insulted and harassed him for being gay (as revealed in [[http://www.youtube.com/watch?v=TmlcuY8bOUk this]] interview).
* RearrangeTheSong: of the original "Go Go Power Rangers".
* RedHerring: Several people are set up as the Gold Ranger, including Billy and Skull.
* ReunionShow: "Rangers Of Two Worlds" brings back the Rangers of Aquitar to team up with the Zeo Rangers.
* TheRez: The whole David Trueheart storyline.
* RoleReprisal: Austin St. John returns as Jason Lee Scott, the original Red Mighty Morphin' Ranger, in "A Golden Homecoming" to become the temporary host of Trey of Triforia's Gold Zeo Ranger powers.
* RoyalsWhoActuallyDoSomething: King Mondo was a villainous example, having fought the Rangers personally on more than one occasion. His eldest son Prince Gasket was even more capable, apparently.
* ShipTease: Tommy and Kat (proceeding to OfficialCouple), Tanya and Adam (tease confirmed by [[https://www.youtube.com/watch?v=yWB2jnc4dUI Nakia Burnise]], Tanya's actress).
* SmellySkunk: Stenchy, one of the MonstersOfTheWeek.
* ShoePhone: While a lot of the later Power Rangers have morphers that have been called shoe phones by the fanbase, Skull. Has. An. [[ExactlyWhatItSaysOnTheTin Actual]]. Shoe. Phone. Make of this what you will.
* ShortTank: Tanya; she had a boyfriend who was intimidated by her athleticism.
* SwappedRoles: A rare permanent example, the original SixthRanger is the hero, while the original hero is the Sixth Ranger.
* TakenForGranite: Jason becomes a ''literal'' Gold Ranger in "The Ranger Who Came In From The Gold".
* TeleportSpam: The Gold Ranger.
* TemptingFate: When monsters from Rita and the Machine Empire hijack the two Megazords and defeat Auric the Conqueror, Kat utters the worst phrase imaginable "Well at least it can't get any worse..." Just as she says that, Mondo sends down a squadron of Cogs.
* WeaksauceWeakness: Cogs are afraid of creatures with a lot of hair (as demonstrated in their fear of dogs). So having a lot of body hair would give one a tremendous psychological advantage against Mondo's cogs.
* WeaponizedHeadgear: The Zeo Megazord's alternate helmets.
* WhatHappenedToTheMouse: It was never explained just what Billy was doing all those times he disappeared and the Gold Ranger would show up.
** Prince Gasket gets gunned down by Ultrazord and blows up... into regular size, and then gets a VillainExitStageLeft when Mondo returns to resume his BigBad role. And then Gasket never appears again.