[[quoteright:180:http://static.tvtropes.org/pmwiki/pub/images/lt/thebigo.jpg]]
[[caption-width-right:180:'''[[ByThePowerOfGreyskull BIG O! SHOWTIME!!!]]''']]
->'''''"Cast in the name of God, ye not guilty"'''''

->''[[http://www.youtube.com/watch?v=oTfbstFoj30 "You're a louse, Roger Smith."]]''
-->-- '''R. Dorothy Waynewright'''

Forty years ago, amnesia struck all the inhabitants of Paradigm City, a strange metropolis that seems to be 75% FilmNoir [[NewYorkCity New York]] and 25% City Of The Future. In the decades since, life has gone on, despite the loss of history, the loss of past, and the loss of self which has struck each and every inhabitant.

Roger Smith is one of them. A former member of the Military Police, Roger now makes his living as a negotiator (a combination of private investigator and professional go-between). It's a job that pays well, as the penthouse atop his private building proves. Roger has been described as half Bruce Wayne, half James Bond -- but when negotiations fail, he has something else to fall back on: The Big O, a giant battle robot (known in this show as a "Megadeus" -- pronounced "mega-deuce" in the English dub and "Mega-day-oos" in the original Japanese) that he stores in the abandoned subway tunnels under the city.

And fall back on it Roger must; after forty years, lost secrets and forgotten memories are returning, and all manner of threats to Paradigm City and its people are coming with them. Aided by his butler Norman and the sarcastic (and opinionated) android girl R. Dorothy Waynewright -- along with (occasionally) his former commanding officer in the police, Major Dan Dastun, and the mysterious and beautiful free agent who tells Roger to just call her "Angel" -- Roger faces off against monstrous forces from all manner of enemies while simultaneously pursuing the truth behind Paradigm City's lost history.

There is a very Japanese cultural perspective here, in that wherever Roger goes in his investigation of the Monster of the Week, the people he talks to always think it is "a god." Apparently anything strange or inexplicable is attributed to the gods. Each of the giant robots is even explicitly referred to as a "Mega''deus''."

Despite that cultural perspective, it turned out to be [[GermansLoveDavidHasselhoff hugely popular]] on its Creator/{{Toonami}} and Creator/AdultSwim runs (the show actually bombed in Japan); it was so popular with American audiences that it wound up getting a second season produced primarily for said audiences (with Adult Swim sharing production credits for the second season). It was even stated by the creator himself that this was his exact intention, wanting to create a show that would appeal to American tastes and sensibilities even if it meant sacrificing the Japanese audience (the show even used the somewhat-foreign concept of a season-ending CliffHanger to set up the second season years before it actually debuted). Although the second season proved popular and managed to pay off its budget, the show was not renewed for a third season (which likely would have answered the ''numerous'' questions the second season left viewers with) as Creator/AdultSwim began to focus on comedies and animated shows that were cheaper to produce.

The second season began airing on the [[UnCancelled revived]] {{Toonami}} block on July 27th of 2013, airing at 3:30 AM and joining the lineup alongside SwordArtOnline. Currently, Toonami only has the rights to air the second season (which they hold indefinitely due to [adult swim] funding it, as mentioned above).

As of 2013, both seasons of ''The Big O'' are licensed in the United States by Creator/SentaiFilmworks.

Not to be confused with [[Anime/MobileSuitZetaGundam The O]]. Or big-O notation in mathematics or computer science. Or the tire store. Or the FanNickname for the Olympic Stadium in Montreal. Or the common nickname for legendary 1960s NBA player Oscar Robertson. Or TheImmodestOrgasm. Or BigNo, either. And try not to mistake the sixth DVD, "The Big O: Missing Pieces" for Creator/ShelSilverstein's book ''The Missing Piece Meets the Big O''. The name actually seems to be one of the many religious references (like "Behemoth and Leviathan") that appear in the show, in this case to "Alpha and Omega" - the name of the Greek letter "Omega" literally means "Big O", in contrast with Omicron (O-Micron), which means "little O".

----
!!''Big O'' Tropes! '''SHOWTIME!''':

* TheAbridgedSeries: ''WebVideo/BigOAbridged''.
* AnimationBump: The show transitioned from hand-drawn to digital animation between the first and second seasons. [[TheyChangedItNowItSucks Whether this constitutes a "bump"]] is a matter for the [[BrokenBase base]].
* AngstComa: In the first episode of the second season, Roger goes introspectively catatonic as he struggles to figure out [[spoiler:just who -- and ''[[TomatoInTheMirror what]]'' -- he is.]]
* ArcWords: "The power of God;" "tomatoes;" "the world is a stage;" "Cast in the Name of God." The final few episodes of the second season have a phrase repeated by several characters, which is "A bird whose wings have been plucked will lose all of its feathers, and turn into the creature that it was before it evolved into a bird."
* ArmCannon: One of Big O's attacks in the second season.
* ArsonMurderAndJaywalking: The Description of Beck in Volume 3 after the fake-Megadeus frees him.
-->'''Norman''': It seems there is an imposter.\\
'''Roger''': So I see...Beck, the would-be criminal prince of amnesiaville is at large again...His speciality is exploiting the hopes of the desperate and the memory-challenged. He is a man without conscience or remorse...and he is a '''Smoker'''.
* AudioAdaptation: "[[http://www.konaka.com/alice6/big-o/index-e.html Walking Together Down The Yellow Brick Road]]", released between the 1st and 2nd seasons. In it, [[spoiler: Roger reveals his commandership of Big O to Dastun.]]
* AwardBaitSong: The first season's ending theme, [[http://www.youtube.com/watch?v=VAg3qLkLPLU "And Forever..."]], is a downtempo male/female duet sung ([[SurprisinglyGoodEnglish in English!]]) over ballad-style piano accompaniment.
* AwesomeButImpractical: The RocketPunch of Big Fau. It looks cool how it can burrow through buildings without stopping. But if destroyed Big Fau has no arms.
* AwesomeMcCoolname: Megadeus, The "Bigs" mechs Big O, Big Fau, Big Duo and Big Venus
* AxeCrazy: Alan Gabriel, who is something of an Expy of Franchise/{{Batman}}'s Joker.
* BadassBiker / BadassMustache: Norman
* BadassLongcoat: Roger sometimes dons a black overcoat or topcoat, as seen in the very first episode when talking to his informant. In Roger the Wanderer, he wears a less badass one.
* BandagedFace: Schwarzwald [[spoiler:and Vera in the last two episodes.]]
* BattleButler: Norman again. The guy has a ''missile launcher'' in the sidecar of his motorcycle!
* BehemothBattle: The titular HumongousMecha battles other robots (called [[AMechaByAnyOthername Megadeus]]) and a few giant monsters over the course of the series.
* BigDamnVillains: In Season 2, Alex Rosewater activates his own Big to stop an attacking Megadeus. It doesn't quite go as planned, though.
* BiggerBad: Big Venus, [[spoiler:which has the power to alter people's memories and even reality itself and is responsible for erasing the memories of all of Paradigm's citizens 40 years ago]].
* BittersweetEnding: [[spoiler: Aww, Pero...]]
* BlingBlingBang: Alan Gabriel can be seen armed with a gold-plated pistol as his personal weapon.
* BookEnds: The first scene of episode one is the last scene of the series. [[GainaxEnding Yup]].
** [[spoiler:The only difference is that both Dorothy and Angel watch Roger drive by.]]
* {{Bowdlerization}}: Besides the usual edits for violence, death, some fanservice (one episode edited out Angel sticking a pair of sunglasses into her cleavage), and imitable vices (read: smoking cigarettes and drinking alcohol), there were also edits to remove anything referencing God or Christianity (even though that's not a common religion in Japan):
** When the first season of the show aired on Toonami, the word "God" in "Cast in the name of God, ye not guilty" was digitally altered to "Good." It's one of the very few changes they made to the show, and it doesn't even hurt the show all that much. (This change would be reversed when Creator/AdultSwim started airing the series.)
** Likewise, Paradigm Corp. is merely "church and state," as opposed to "[[AGodAmI God]] and state" (which doesn't really make a difference, as it's still a religious reference).
** They also changed the name of this electric serpent in #3 from "god" to "titan".
** Episode 9 (Winter Night Phantom) had a crucifix digitally removed from the sequence where a little girl blows up a cathedral with a bomb (which was also edited).
** Episode 11 (Daemonseed) edited all the Christian comparisons to Heaven's Day being like Christmas (which kills the meaning of the episode).
* BrawlerLock: In episode 17 "Leviathan" Big O grabs the title megadeus's pincers during their battle.
* BreatherEpisode
** [[CrowningMomentOfFunny Episode 18]] which comes straight after 2 back-to-back dead serious episodes.
** Episode 22 (Hydra) is a relative breather episode. While it has several important points such as [[spoiler: Roger's memory of being in some sort of war, as well as the re-energization of Big Fau]], it comes right after the two-parter of Stripes and The Third Big, which includes [[spoiler: Big Fau's first appearance and the revelation of the Union]] and is followed by what is basically the beginning of the GrandFinale.
* BriefcaseFullOfMoney: How Roger negotiates Dorothy's release from Beck in the first episode. Afterwards, he activates the briefcase by remote control which leaves Beck without any money.
* BrokenBird: Angel.
* BrokenMasquerade: Near the end of the second season, Gordon Rosewater proclaims that [[spoiler:there never were any memories before 40 years ago]]. Then, Angel starts to [[spoiler:delete the world systematically herself...followed by the season's GainaxEnding of a then-cancelled show.)]]
* CallingYourAttacks
** Just once, but it's a doozy.
** Not ''attacks'', but it seems to be a requirement to say "Showtime!" and/or "Action!" to start up a Megadeus.
** In addition, Roger has to call out "Big O!" to get Big O to transport to his location.
** The specific words "Big O" and "Showtime" may not be specifically necessary, but Roger's voice is. In fact, this is exploited in an episode when the villain somehow manages to craft an animatronic bust of Roger which is a perfect replica of his face and chest cavity, so that it will have Roger's voice (I guess synthetic vocal chords sound just like the regular kind); he then sets it on a little automated buggy and has it shout "Big O!" into one of Roger's watches, over and over, so that the robot is too busy chasing the bust to come to the aid of the negotiator. Fortunately, [[spoiler:once the buggy falls into the water, Big O stops in its tracks, as with no voice command to follow, it has no reason to move]], foiling the villain's plans.
* CallToAgriculture: Gordon Rosewater and his tomatoes.
* CanonForeigner: In the manga, Beck's gang has a female member in addition to the squat black guy and the CampGay guy. It also has [[spoiler:Big Four, an alternate version of Big Fau that is piloted by Angel.]]
* CharClone: Schwartzwald: masked character with his own agenda, consistent rival to the lead, pilots three red mechs, and they are more maneuverable (three times faster).
* CheekyMouth
* ChestBlaster: [[spoiler: Big O's Final Stage.]] It's also got rockets hidden under the chest armor. The Chrome Buster acts like a standard SuperRobot ChestBlaster but it's fired from the forehead.
* ChromaticArrangement: The lighting in the cockpits of certain megadeuses are Red (Big O), Blue (Big Fau) and Yellow (Big Duo).
* CliffHanger: And how!
* CloningBlues: [[spoiler:Alex Rosewater]] is apparently a clone created by Gordon Rosewater's "tomato" project. He already has inferiority issues, and goes completely insane when he finds out.
* CombiningMecha: Jason Beck's custom-made machine, which proves to be [[http://www.youtube.com/watch?v=NIbYfPbGc0Y utterly useless]] (taken out by what it essentially Big O's ''side arm'' in ''two seconds'')... [[CrowningMomentOfFunny hilariously, utterly useless]].
* TheComicallySerious: R Dorothy, who seems to get most of her humor from her deadpan expression and monotone for everything she does.
* ConspiracyTheorist: Schwarzwald, even though most of what he claims turns out, in least to some extent, [[spoiler:to be true.]]
* ContemplateOurNavels
* CoolBike: Norman's bike, complete with CoolSidecar with a missile launcher.
* CoolCar: The Griffon, Roger's personal ride.
* CoolGarage: ''two'' of these one was a giant hangar in his mansion that stored the Big O (his giant robot) and his car, and the other was the left foot of the Big O.
* CoolHouse: Roger's. It was apparently a bank once and now has a defense system that includes machine guns.
* CoolOldGuy: Norman, Roger's butler.
* CoolShades: Goes with his suit.
* CPRCleanPrettyReliable: Subverted in final episode "The Show Must Go On" with this quote:
-->'''Roger''': You could've come up with a gentler way to bring me around, you know. [[KissOfLife Like, mouth to mouth, or something?]]
-->'''Dorothy''': Not with the displacement capacity of my air tank. You're such a louse, Roger Smith.
-->'''Roger''': Heh, you're definitely our Dorothy.
* CulturedBadass: Roger Smith and Alex Rosewater; Beck tries for, and fails at, this.
* CutShort
** Although it's not an overt cliffhanger, the second season was apparently written under the understanding that there would be a third. Unanswered: [[spoiler:Angel apparently remade the entire holographic world, but did she keep that power or give it up? Do people remember what happened? Is Alex Rosewater still at large, and is he really the BigBad? Was the giant dome over the city restored, and if so, won't the lights fall and devastate the city all over again? Above all, ''why'' did someone trap a city of people in a giant holodeck with no memories?]]
** The finale was set up so it could work both as a conclusion to the series and as a way to set up a third season. In other words, the creators wrote it that way with full knowledge that they might not be able to make any more (which is also how they wrote the season one finale.) And considering that this is Big O we're talking about, a third season would likely have ended even ''more'' ambiguously.
* DeadManWriting: In episode 24 Roger receives a letter from Michael Seebach (Schwartzwald), which was to be delivered after his death.
* DeadpanSnarker: R. Dorothy Wayneright. So very much.
* DisneyDeath: [[spoiler:Most of the show's world is destroyed over episodes 23-26, then undestroyed.]]
* DoesntLikeGuns: Roger on the in-verse Justification that it's not "gentleman"-like and meta-verse Justification of being based on Batman.
* DomedHometown: Paradigm City has a series of domes that house the wealthy citizens. It's implied, however, that [[spoiler:the entire city is under one massive dome]].
* DramaticChaseOpening: The episode "Hydra" begins with a female agent of the Union being pursued through the streets of Paradigm City by members of the Military Police.
* DynamicEntry
** Although Big O is a rather slow moving robot, he scores several of these on opponents. In episode 13, Big O rises from beneath the ground to save Roger from psychopath android Red Destiny. Big O does this by smashing said android into the ceiling of the subway tunnel both Roger and Red Destiny were standing in.
** Additionally, Big O punches through a wall to save Dorothy from a spider-mech in season 2.
** Beck's "Victory Deluxe" attempts to mimic the Big O's dynamic rising from the ground, [[EpicFail but it briefly gets stuck halfway through.]]
* EarlyBirdCameo: Big Fau is seen in a vision in Episode 13 at least a good 6 episodes before it would make an official appearance.
* EmotionlessGirl: Dorothy by way of being a RobotGirl. Maybe subverted, considering she snarks at every opportunity and has no qualms about annoying Roger. She also expresses warmth and fondness for Norman.
* EmpathicWeapon
** The Megadei all have what appears to be a system of judging the worthiness of their pilot. When they turn on, a display says "Cast in the Name of God, Ye Not Guilty" if the robot accepts its pilot. They also turn off several times throughout the series in response to the pilot's emotional state. The Megadei even seem to be able to be able to move of their own volition in a limited fashion. Pilots are frequently caught in the hands of their Megadeus before they get in the cockpit. Big O goes so far as to punch through a wall to protect Dorothy even though it wasn't being piloted. [[spoiler: so obviously they can think and act on their own if their owner is in danger or in need]]
** In the one instance where a Megadeus deems it's pilot particularly unworthy , it flashed the words "Ye Guilty" on the display. Then it proceeded to "eat" him.
** Episode 21 had Big Fau, the Third Big, respond to Alex's screams that he was its Dominus with "Cast in the name of God...Ye Not."
** Incidentally, the phrase "Cast in the name of God, ye not guilty" used to be put on the axes of executioners. In Christianity (the religion of the countries that did this with their executioner axes) the death penalty is explicitly commanded by God as punishment for the crime of murder, thus the inscription reminded the executioner that he himself was not committing murder, but justice. In the series the megadeuses seem to fight just wars rather than perform executions.
** The Big units also appear to be able to recognize other Big-type units. In episode 21, all it took for Big O to subdue Big Fau, who was going berserk while being piloted by Alex, amounts to a silent GetAHoldOfYourselfMan gesture and little talk from Roger, at which point it shut itself down.
* EndOfTheWorldSpecial: [[spoiler:Angel, in the finale.]]
* EpicFail: In "Beck Comes Back", Beck's "Victory Deluxe" Megadeus attempts to make a big entrance to challenge Roger and the Big O--only to get stuck halfway rising up. And even when it does become battle ready, it's missiles and lasers prove to be [[NoSell utterly useless against the Big O]], which promptly [[OffWithHisHead decapitates Beck's robot.]]
** In "The Greatest Villain", Beck gets his giant combining robot destroyed in ''seconds'' by the Big O before it can even attack. By one of it's weaker side-arm weapons, at that!
* EvaFins: Schwarzwald's Big Duo has them, "Big O" too.
* EvenBadMenLoveTheirMamas: An AmoralAttorney hires Smith on behalf of his mother to find the corpse of the WhiteSheep of the family.
* EveryEpisodeEnding: "We have come to terms" or "No Side." Probably in reference to the fact that Roger is a negotiator with a life and friends. Whenever his social interactions result in him or his friends winning or benefitting it says "we have come to terms," but whenever it is a draw or nobody truly wins or benefits it says "no side."
* EvilLaugh: Schwarzwald and Alan Gabriel.
* EvilPlan: Alex Rosewater is doing something sinister with Big Fau and Alan Gabriel has his own agenda and the Union is up to something but due to the MindScrew it's hard to tall what. Beck has the much more straight-forward 'make lots of money illegally' deal.
* EvilTwin: Red Destiny is this for R. Dorothy; she appears for a grand total of one episode.
* ExactWords: Dorothy, a ThreeLawsCompliant android, is being attacked by the [[AmbiguousRobots Ambiguously Robotic]] Alan Gabriel and making no move to defend herself. In a bit of mid-fight banter, she asks Gabriel if he's human or an android like her. Gabriel mockingly replies that "I'm the boogeyman!" Dorothy takes his statement at face value, concludes that [[TooDumbToLive he has just admitted to not being human]] and therefore fair game according to her programming, and proceeds to [[CurbStompBattle effortlessly take him apart]]. (WordOfGod later revealed that Gabriel is in fact a cyborg.)
* {{Expy}}
** Roger was deliberately designed to resemble [[Franchise/{{Batman}} Bruce Wayne]]. Norman is essentially Alfred. With [[BattleButler ordnance]]...well, okay, ''more'' ordnance.
** And Alan Gabriel is pretty much the Joker with a drill hand.
** They even have a Jim Gordon! With shades of Harvey Bullock, as Dastun is less-than-thrilled about Roger solving what the police aren't able to (which is almost everything).
** Beck
*** ...is the Riddler, more or less.
*** Unrelated to Batman for once, Beck is meant to be a parody of {{Anime/Lupin III}}.
** And Angel would be Catwoman. Really, we could go on and on.
** They also appear to use a [[WesternAnimation/BatmanTheAnimatedSeries very specific version]] of the Batman Mythos for inspiration. Gotham and Paradigm are designed with ''very'' similar "Dark Deco" styles, Roger is pretty much an anime version of Bruce's redesign for ''The New Batman Adventures,'' Angel is blonde, just like Selina Kyle in the animated series (in the comics she has black hair), Norman is just Alfred with an eyepatch, and Dorothy's red hair and relationship with Roger seems inspired by both Barbara Gordon and Dick Grayson [[spoiler: except Dorothy is just better]], and as mentioned before Dan Daustin is a combination of Commissioner Gordon and Harvey Bullock (Batman: TAS is where Harvey Bullock first saw mainstream success). In fact, Sunrise Studios worked on animation for ''WesternAnimation/BatmanTheAnimatedSeries'' prior to the creation of The Big O.
** Big O's face is basically [[RobotDetective Robot Keiji K's]]. No, really! ...made better with R. Frederick O'Reilly's appearance later on, who strongly resembles Robot Keiji K in everything ''but'' the face.
** Let's take it a step further: since the premise of this show involves a city that without memories it's very possible that all of these people are just the citizens of Gotham... just kidding.
* EyeBeams
* EyepatchOfPower: Again, Norman. (''Especially'' in the manga, where he has to face down a group of armed, arsonist youngsters in a church. He covers the one remaining eye of a goddess statue with his eyepatch, picks up a firearm, tells the punks, "THIS is how you use a machine gun," and ''shoots a perfect outline of the group in the wall behind them''. He succeeds in leaving Dorothy speechless and wide-eyed. Then they go home and he makes ''dinner''.)
* FacePalmOfDoom: the eponymous mecha's signature attack (Sudden Impact) can work like this by it grabbing an opponent's head and retracting the pressurized pistons inside the arms and subsequently releasing them ForMassiveDamage. Its power seems to be adjustable. When Roger did this to Beck's Megadeus, it completely separated the head and cockpit from the rest of the body. When he did it earlier against Beck's van, however, the van and its occupants were largely intact and merely shaken up.
* FakeMemories: Played completely straight with [[spoiler:Angel]], but largely inverted with the apparent [[spoiler:fake amnesia the entire city suffers]].
* FilmNoir / FantasticNoir: A ''lot'' of the series's style comes from this.
* FirstChurchOfMecha
* FiveRoundsRapid: A staple of Paradigm's Military Police. They accomplish something on occasion, but it's the exception rather than the norm.
* {{Flanderization}}: Beck's lackeys used to be normal-sized humans prior to his VillainDecay.
* FrequentlyBrokenUnbreakableVow: Though Roger would prefer negotiation, the Big O sure is used a lot.
* FunnyAfro: Beck and his gang sport this in episode 18.
* GadgetWatches: Roger's wristwatch, which can summon Big O, control his car, detect missile lock-ons, and has a grappling hook. But it never gets used to tell the time. However it does appear to have hands to tell times in the form of a triangle and a circle. [[spoiler: so obviously he uses it to tell time]] It also has a laser-powered cutting torch.
* GatlingGood: Big O's ArmCannon added in the 2nd season consists of the forearm opening up into a multi-barrel rotary beam cannon.
* GainaxEnding: Though it may not have originally intended to be one.
* GeniusDitz: Beck is a total moron at being a villain, but he's practically an idiot savant with neural AI technology. Sadly, his smarts are mostly used in pursuit of his villain aspirations. Maybe justified in that Beck's skills may come from his own awakening memories.
* GenreBusting: It's a FilmNoir, Science Fiction, GiantMecha, Detective story, Psychological mindscrew with Franchise/{{Batman}} overtones.
* GiantRobotHandsSaveLives: Roger and Schwartzwald fall into their giant robots' hands and survive several times. Roger has also done this for other people. Thank you, gentle robot friend.
* AGodAmI: Eugene Grant, the [[AxCrazy crazy as fuck]] MadScientist
* GoneHorriblyRight: Alan Gabriel wanted to combine with his Megadeus. [[BeCarefulWhatYouWishFor He got it.]]
--> Cast in the name of god, [[spoiler:ye guilty]]
* GrandFinale
** More like a '''Final Stage'''.
** Roger says this in ''VideoGame/SuperRobotWarsZ''. [[GratuitousEnglish In English... sort of.]] Two of the Z games, Z1 and Z3-1 respectively, also do a lot to help expand and clear things up regarding the story, even having a proper fight against [[spoiler: Big Venus]].
* GratuitousEnglish
** English words and phrases meshed awkwardly with Japanese, as well as one episode where a phrase in gratuitous French acts as ArcWords, and some grammatically incorrect German and Latin.
** American viewers need not worry about this, obviously, especially since the dub's quality is excellent.
** Though if you listen to the opening's lyrics closely...
* GratuitousGerman: Michael Seebach a.k.a. Schwarzwald ([[https://en.wikipedia.org/wiki/Black_Forest named after the famous mountain range in Germany]]) assaults the ears of the Japanese viewers with really, really poor attempts at speaking German. Anyone listing to the English dub is spared from this.
** They also misspell Seebach's name (they spell it with an "Z" at the beginning).
* GunsAreWorthless: For the most part Big O's most effective weapons are its piston powered fists. Despite its many ranged weapons, the solid missiles and cannons never ever work, and the energy weapons also usually don't. To the point where an energy blast is less effective against a meteor falling to the city then punching it right before it hits.
* HeroesWantRedheads: Dorothy
* HeroicBSOD: The CliffHanger of the episode "Stripes," with Heroic Error Windows popping up throughout the series.
* HeroicRROD: Inverted in the final episode, where Alex Rosewater [[spoiler:allows Big Fau to integrate completely with him; the Memory Core behind him turns sideways and becomes a red hourglass]].
* HumongousMecha: The title robot, and other robots he faces.
* InfantImmortality: Averted. ''Winter Night Phantom'' makes it clear that a child was at ground zero of a bombing and did not survive.
* InnerMonologue
* IntimidationDemonstration: "The Greatest Villain". Before Beck fights Roger Smith he does some fancy maneuvers with a giant boomerang-like weapon his megadeus created...[[CrowningMomentOfFunny then the whole thing is blown up in 2 seconds flat...]]
* InvincibleHero: While by no means TheProtagonist, Dastun goes through all manner of what can only be described as "serious shit" and always comes out in one piece.
* ItOnlyWorksOnce: Roger only gets one shot with [[spoiler:Big O's Final Stage]]. [[spoiler: He misses, and the energy output burns the gun to a crisp afterward]].
* {{Kaiju}}: Big O fights several giant monsters.
* KarmicDeath: [[spoiler:Alan Gabriel]] gets done in by the very Megadeus that he's piloting.
* KudzuPlot: ''It's like a friggin' [[KatamariDamacy katamari ball]] went through an EpilepticTree orchard''.
* LandSeaSky: Big-O, Big-Fau, and Big-Duo respectively.
* LaughablyEvil: Jason Beck has funny hair, a Riddler like demeanor, and is the butt of jokes.
* LeaderFormsTheHead: In "The Greatest Villain", when Beck and his henchmen form their giant mecha RX-3, the part Beck is controlling becomes the head. Watch it [[http://www.youtube.com/watch?v=NIbYfPbGc0Y here]].
* LeftHanging: Several episodes, including the finale.
* LetsGetDangerous
* LongPants: Roger is sometimes drawn like this. Wearing all black helps.
* MachineWorship: The humans think that the various HumongousMecha popping up everywhere are gods. The [[MeaningfulName Megadei]] [[DeusEstMachina have a fairly good claim to the title]], being supposedly "Cast In The Name Of God" and sentient to some degree.
* MadScientist: Eugene Grant
* MeaningfulName: The term Megadeus transliterated means something along the lines of "giant god." And everything bearing the name is huge, and powerful.
* AMechByAnyOtherName: No, Big O isn't a mech. He'a a [[InsistentTerminology Megadeus]]. And so are all the other mechs.
* MegaCorp
* TheMenInBlack: Roger Smith mainly, due to him nearly ALWAYS being shown wearing a black suit and tie (sometimes with matching shades), even in the heat of battle. This is expanded upon by Roger's rule that everyone living in his home must wear black as well (though Dorothy finds a loophole by wearing a very dark red blouse on at least one occasion). Even Roger's car and the series's titular mecha are black. As for the "memories" and "Conspiracy" and "Government Agent" parts....see MindScrew. It Zigzags all over the place.
* MerchandiseDriven: Believe it or not, the anime was originally written to advertise a line of giant robot toys. Some have commented that it would be superior if the mecha were removed altogether.
* MerryChristmasInGotham: The Christmas special starts out grim as usual. We have a blind girl whose lover is a garbageman by day, and musician by night. They are starving, barely able to afford food at all. Then a mad scientist leaves a biological weapon in the boy's tip jar and it turns out the "weapon" is a massive self-growing Christmas tree made to teach people to love nature and each other. While the tree grows, everyone hears the boy's music, Roger and Dorothy exchange presents and have an impromptu dance party, and it snows.
* MightyGlacier
** The Big O itself is a non-fighting game example. Unlike other mecha shows where increasingly even the real robot-type machines show increasing amounts of ninja-like agility, the Big O is massive, plodding, unsubtle, and destructive. When it's shot from a distance it's shown that it can actually move quite quickly (like a car with low acceleration but high top speed), but it's so heavy it can't stop on a dime, and it's not exactly graceful. Of course, it's got tremendous amounts of firepower, with even its weakest weapons blasting tremendous holes in skyscrapers. [[spoiler: Its [[WaveMotionGun Final Stage]] canon blows away most of a city the size of New York.]] In addition, its armor seems impervious to all but the most powerful attacks in the series, taking only minor damage usually. Its Arm Shields are notably stronger then the rest of its armor, being visibly damaged (said damage being a long, thin scratch from a Megadeus's sword) just ONCE in the entire show.
** Most of the Megadei are massive and cumbersome. Even the flying Big Duo handles more like a heavy bomber than an interceptor, flying mostly in straight lines and needing vast amounts of space to make a turn. The exception is the Archetype, a LightningBruiser which is apparently the stripped-down skeleton of a Megadeus and moves with the agility of a monkey.
* MindScrew: Oh boy, where to begin.
** Try and explain the ending. Go on. Try.
** Considering the show was written by Creator/ChiakiKonaka, the man who brought us ''Anime/SerialExperimentsLain'' and ''Anime/DigimonTamers'', this is probably to be expected.
** There's also episode 14. Watch it.
* MindRape: The premise of the show is that this happened ([[MindScrew or may not have]]) to everyone 40 years ago, giving them amnesia. The problem is that there are objects and people over the city that cause the memories to reemerge, thus mind-raping them once more.
* TheMirrorShowsYourTrueSelf: Roger and Dorothy near the end of episode 14.
* MonsterOfTheWeek
* MyGodWhatHaveIDone: Angel has one when she realizes she was willing to allow Alan to kill Dorothy since she believed Roger cared for Dorothy more than her.
* MysteriousInformant: Big Ear, Roger's information source.
* NietzscheWannabe: Schwarzwald. Also a Thomas Hobbes Wannabe; compare his narration in the episode "Leviathan" with Hobbes's book of the same name.
* NotAMorningPerson: Roger, often shown waking up after 1 PM to hilarious effect when Dorothy plays a run down on the piano in order to wake him up.
* NotSoDifferent
* OhCrap: Schwarzwald has this look in Episode 12 when the tables turn on him.
** Alan Gabriel gets his own later.
-->"Ye Guilty."
* OlderThanTheyLook: [[spoiler:There are hints that Roger was around forty years ago in some form, despite looking no more than thirty or thirty-five. On the other hand, he seemingly has flashbacks of being a child during the tomato experiment 15 years ago. [[MindScrew So yeah.]]]]
* TheOnlyOneAllowedToDefeatYou: Beck towards Roger (who considers Beck a common thug and really not worth the time or attention); this ends up being a plot point in the GrandFinale, however...
* OntologicalMystery
* OpeningACanOfClones
* OvertRendezvous: Roger always meets with his street informant Big Ear in a bar.
* PileBunker: Big O has them, and they amplify its punches.
* PlotBasedPhotographObfuscation: The old, torn picture of Gordon Rosewater and... [[spoiler: ...''Roger''?]]
* PoliceAreUseless: Generally [[JustifiedTrope justified]], as the only times Roger normally finds himself dealing with criminals are negotiating hostage situations where calling the police would endanger the captive, and HumongousMecha attacks that the police are understandably unprepared for.
* PrecisionFStrike: Just about the only swearing in the series is Norman, faced with robot insects, opening fire with twin machine guns with a yell of "Sons of ''bitches!''"
* PrettyInMink: A few fur coats in the background, and one or two of Angel's outfits have them..
* PrivateEyeMonologue: Roger does this almost every episode, especially in the first season.
--> "My name is Roger Smith. I perform a much-needed job here in this city of amnesia..."
* PsychoForHire: Alan Gabriel.
* PunchParry: During the fight between Big O and Big Duo in episode #24.
* PunchPunchPunchUhOh: Beck's golden Megadeus against Big O.
--> '''Beck''': "...The beam just bounced off..."
* RaysFromHeaven: In episode 14, "Roger the Wanderer". At the end of Roger's hallucination he rediscovers his sense of purpose and finds himself back in Big O. After he knocks down all three of the foreign megadeuses, rays of sunlight shine through the clouds above as he prepares his final attack, which disables his opponents and saves Paradigm City. Watch the sequence [[http://www.youtube.com/watch?v=X8HOKY3AMF8#t=3m13s here]].
* RealityEnsues: The killer tree in episode 11. A gigantic, fast-growing plant cut off from any meaningful nutrients will not be able to grow for very long.
* RealRobot: The Megadei, especially the titular Big O, straddle the line between this and SuperRobot. While shown to be much bigger than reality would allow, they're all incredibly big, bulky, and slow with the amount of mass they carry. When Big O is knocked over Roger literally has NoPlansNoPrototypeNoBackup when it comes to getting back on his feet, the classic SuperRobot staple attacks are used sparingly, [[spoiler:Big Fau]] is the only mech to have a RocketPunch (and firing them means it's permanently lost its hands and arms), and the one time [[spoiler:Big O]] uses [[spoiler:'Final Stage', the chest-mounted WaveMotionGun]], it has to anchor itself into the ground, and the energy output is so great the weapon destroys itself in the act of firing.
* TheReasonYouSuckSpeech: Big Duo gives the shortest one on record to [[spoiler: Alan Gabriel and proceeds to absorb and kill him, since he is an insane sadistic motherfucker and thus not worthy of piloting a Megadeus]]: "Ye Guilty."
* RecursiveCanon
* {{Reconstruction}}: Of HumongousMecha anime.
* RedEyesTakeWarning: Several examples in the episode "Eyewitness".
* RedHerring: Episode 13 pretty much makes it looks like that R. Dorothy or Angel is the serial killer. [[spoiler: It turns out to be Dorothy's EvilTwin.]]
* RedshirtArmy: They DO get a CrowningMomentOfAwesome at the end of the series, though.
* ReplacementGoldfish: Dorothy to the real (deceased) Dorothy.
* TheRevolutionWillNotBeCivilized: The Union wants to break Alex Rosewater's hold on the world (and recover the memories they believe he's hiding) by destroying Paradigm City.
* RocketPunch: [[spoiler: Big Fau.]]
* RoguesGallery
** Arguably the reappearing [[LaughablyEvil Beck]], [[AxeCrazy Alan Gabriel]], and [[ConspiracyTheorist Schwarzwald]]. This makes even more sense when you think about the possible allusion to [[Franchise/{{Batman}} another Rogues Gallery]]...
** The three of them arguably split elements of the Joker. Beck has the manic personality and base criminal desires, Alan is a sadistic killer, and Schwarzwald is a crazed sociopath whose actions only make sense to himself.
** The differing chunks of similarities seems played with when Alan Gabriel is rejected by Big Duo; Schwarzwald, despite being quite deceased for half the series, seems to manifest through Big Duo to actively berate Alan's gleefully pointless killing as being ''unworthy'' compared to his own motivations. Alan may have had the killing down, but it takes more than killing to make you worthy of being the Joker expy of the series.
* RuleOfCool: Face it, when the plots run shoestring thin in terms of making sense, this is the glue which holds everything together.
* RunningGag: R. Dorothy waking Roger up by playing the piano.
* RuinsOfTheModernAge
** Though never said out loud, it's made damn clear that Paradigm City is built on top of New York City. To drive the point home, every instance of a notable New York landmark showing up, generally shows that landmark (and everything around it) destroyed.
** In Episode 5, it's mentioned that a man fell into the Hudson. In that same episode, its revealed that the bridge he fell from is the George Washington Bridge.
** Several track titles on the Original Sound Score II album allude to actual Manhattan streets and locations.
** Several key storyline events happen in Grand Central Station.
** A JFK Mark is mentioned, almost certainly a reference to New York's JFK Airport. The airport itself is seen (in ruins) in the same episode. Its later implied that Big Duo was found here.
** Mad Scientist Eugene Grant's lab appears to be based in the American Museum of Natural History.
** In the episode "Leviathan", Coney Island and its famous roller coaster, Cyclone, are visible in the wastelands just outside the city.
** Roger likes driving across the Brooklyn Bridge, fully visible in the 3rd episode. It is one of the few New York landmarks that isn't destroyed.
** There's also the fact that Alex Rosewater has an account at [[http://img163.imageshack.us/img163/9066/gpbigo12x264da8050femkv.jpg Bank of America]], though this one is more likely just a case of GratuitousEnglish.
*** Then again, in the first episode, Roger hands the Big Ear what looks like American Federal Reserve Notes (a roll of 20s to be exact), so this might not be so gratuitous...
* SaharanShipwreck
* SandIsWater: The "Leviathan" is bigger than Big O, but it's freaking fast in the sand. Possibly justified since it appears to disintegrate any solids on contact, maybe it makes the sand mushier or something.
* SandWorm: In episode 17 "Leviathan", the title megadeus is a giant mechanical version.
* ScannableMan: Only in flashback.
* ScaryShinyGlasses: Episode 18 "The Greatest Villain". Beck's glasses have this trait while he's showing off his hostage Roger Smith.
* SchizoTech: Lampshaded, and possibly connected to the OntologicalMystery.
* SelfParody: Does a little of this in episode 18, the funniest one in the series.
** SelfDeprecatingHumor: The Megadeus Smith defeated the fastest was the Japanese model (one shot and it was toast).
* ShipTease
** Several, but the most memorably hilarious one comes from episode 18, where Dorothy declares her love for Roger...not.
** Pretty much the entire "Heaven's Day" episode was a ship tease between Roger and Dorthy, from people commenting on how they make a cute couple to going out of their way to get gifts for each other.
* SinisterSubway: Though the residents of Paradigm City believe this is true about their own subway, they are apparently very safe and are used by Roger Smith to transport his robot, though, it should be noted that Roger has only mapped out the basic system (and has yet to explore what is ''beneath'' the subway).
* ShoutOut
** Many to Franchise/{{Batman}}, as well as some memorably hilarious nods to older SuperRobot shows in "The Greatest Villain", specifically GetterRobo with its CombiningMecha.
** In the final seconds of the episode "Eyewitness," [[http://static.tvtropes.org/pmwiki/pub/images/Lois&Jimmy_jpg.jpg two]] [[IntrepidReporter intrepid reporters]] show up to interview Dastun. Notice how even Roger seems surprised!
** Also, the practice of using "R." as an honorific for androids is a ShoutOut to R. Daneel Olivaw in ''Literature/TheCavesOfSteel'', and some of [[Creator/IsaacAsimov Asimov's]] other robot stories. The "R" stands for "Robot," of course.
** Norman's bikeplate is M*ASH.
** In "Eyewitness," Angel's car is parked next to a pink version of the ([[WesternAnimation/BatmanTheAnimatedSeries Animated]]) Batmobile.
** The specific choice of genetically-engineered ''tomatoes'' as Gordon Rosewater's metaphor for artifical humans likely stems from George H. Scithers's [[TropeNamer trope-naming]] use of the phrase TomatoSurprise.
** The opening credits for the first season use the same animated background effect as the opening for ''Series/UltraSeven''.
* SissyVillain: Eugene, in the dub
* SpellMyNameWithAnS: Almost certainly by accident, R. Dorothy Wayneright has a very similar name to a character on YesMinister, Dorothy Wainwright. Go on and guess what the "Wayne" part refers too...
* SpiritAdvisor
** Played with in the manga. [[spoiler: Schwartzwald appears makes his first appearance in the manga (post-disfigurement) as what may or may not be a drunken hallucination of Roger's. While he makes a physical appearance piloting Big Duo, Schwartzwald continues appearing to Roger while he pilots Big O, pointing out the parallels between the two of them as far as their attitude towards memories go and even giving him the occasional motivating speech.]]
** [[spoiler: And in the final chapter, Angel gets one as well...in the form of [[http://www.mangareader.net/the-big-o/6/159 Beck.]] ]]
* StockFootage
** Spoofed/homaged in a CombiningMecha's transformation sequence, which fades out exactly as if transitioning to stock footage, despite the fact that it only appears in one episode.
** Also played completely straight with a variety of car driving scenes that get repeated throughout the series - Roger passes a certain compact no fewer than five times on the highway.
** Spoofed with episode 18 where Dorothy imitated the driving scenes ''with a bike''.
* Dorothy's piano playing from episode 6, ''became'' this in season two. Made even more obvious due to its older style of coloring, as opposed to the digital coloring process of season two.
* VideoGame/SuperRobotWars: The Big O has appeared in ''[[VideoGame/SuperRobotWarsDestiny D]]'' and ''[[VideoGame/SuperRobotWarsZ Z]]''. Roger is significantly more verbose in the latter while piloting Big O than he ever was in the show (justified since this is a mostly text-based game). Dorothy will occasionally perform the actual action in D as well. She becomes a subpilot in Z and at one point she and Norman help [[{{Daitarn3}} Banjo]] and his people masquerade as maids and butlers. Set to reappear in the sequel to ''Z''.
* SuperSenses It would seem that Roger can hear pedestrians talking and shouting to him from the midst of a megadeus battle ground zero because Big O can hear that well.
* SurprisinglyGoodEnglish: The ending duet, sung by Robbie Danzie and Takao Naoki, actually sings pretty well in English.
* TakeOurWordForIt: Dorthy seems to have a beautiful singing voice, but she only hums and plays the piano.
* TechnicalPacifist
** Roger. he refuses to carry a gun or commit an act of violence against a woman. This does not prevent him from using Big O's arsenal of Gatling cannons, lasers, pile driver punches (which usually blow through nearby buildings after holing their target). The local police often ''dread'' the destruction caused when Big O shows up.
** Again, this is par for the course in the long line of Franchise/{{Batman}} shout outs, Bats himself refuses to use a gun but has no problem arming his various cars, motorcycles, jets, and other equipment with enough ordinance to completely level a small country. He has also shown himself as perfectly capable of wielding a gun.
* TelescopingRobot
** Big O and the other [[AMechByAnyOtherName Megadei]]. Not so much as to be unbelievable in terms of mass and volume, but in overall ''context''...
** Final Stage pushes it though. Even if it assumes that the "barrel" of the gun is hollow, it pushes the mass of Big O to extremes
* ThatManIsDead: Schwarzald, and later referred in a dialogue between Roger and a Paradigm Group Executive.
* ThisIsADrill
** Gabriel's prosthetic hand.
** And later, [[spoiler:Big Duo]]'s hands, when - appropriately enough - [[spoiler:being driven by Gabriel]].
* TimmStyle: A rare {{Anime}} example.
* TitleThemeTune
* TrumanShowPlot: Debatable, but in a possible ShoutOut, a spotlight falls from the sky and pretty much [[ExactlyWhatItSaysOnTheTin tells it like it is]].
* {{Tsundere}}: Roger is very much the male tsundere. Dorothy and Angel also have some tsundere traits.
* UnCancelled: Thanks to Americans, surprisingly enough.
* WaveMotionGun
** [[CrowningMomentOfAwesome "BIG O! FINAL STAGE!"]] [[spoiler:He missed - possibly due to Roger being a TechnicalPacifist.]]
** The Chrome Buster is a smaller version of one.
* WhatHappenedToTheMouse: In the penultimate episode, a giant robot twenty times bigger than any of the Megadei is introduced and shown on screen for 3 seconds before it gets [[DroppedABridgeOnHim crushed by a chunk of falling debris]], and is never mentioned again. WordOfGod says that this was the Behemoth, the counterpart to the Leviathan activated by Schwarzwald, that was awakened by Vera and The Union in a final attempt to destroy Paradigm City. This was hinted and foreshadowed a little, but no one is gonna blame you for not being able to figure it out yourself.
* WhenItAllBegan: Forty years ago.
* WhipItGood: In episode 25 "The War of Paradigm City", Agent 12 of the Union uses a whip several times.
* WiseBeyondTheirYears: Roger ([[spoiler: Or is he?]]). WordOfGod says they wanted Roger to avert the "KidHero" trope so the protagonist would be someone kids could look up to and, for the older viewers, someone they can relate to.
* WorldLimitedToThePlot [[spoiler:An extreme example,where this fact is actually central to the plot.]]
* TheWorfBarrage: Usually played straight, but subverted hilariously in "The Greatest Villain" - Beck's robot appears to block it, then falls apart a second later, resulting in an ''extremely'' short fight. Even mentioned in ''VideoGame/SuperRobotWarsZ'' where its encyclopedia entry notes "it did not get any fight scene."
* WouldntHitAGirl: Roger.
* YouMeanXmas: Heaven's Day which is pretty blatantly Christmas under another name. Even Rosewater points it out near the end of the episode. Justified though due to the mass amnesia.
* YoungerThanTheyLook
** Dorothy. It's never lampshaded, despite the romantic interest that seems to develop between her and Roger; on the other hand, maybe this is normal in a city where androids and humans coexist as equals. However, being an android Dorothy is technically ageless and is more than equal to the characters of the series. Being technically ageless and having been designed to be who she is, her lifetime time since her activation is irrelevant and it's really a nonexistent problem.
** Though as mentioned above, [[spoiler:this [[EpilepticTrees possibly]] applies to [[MindScrew Roger]] as well]]. [[invoked]]
* ZeppelinsFromAnotherWorld: Though only in the background.

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'''"We have come to terms"'''

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