[[quoteright:300:http://static.tvtropes.org/pmwiki/pub/images/JeegClassic.jpg]]

->''"BUILD UP!"''

''Kotetsu Jeeg'' (鋼鉄ジーグ, Kōtetsu Jīgu), more commonly known as Koutetsu Jeeg, Steel Jeeg or even "El Vengador", is another classic HumongousMecha anime created by GoNagai in cooperation with Tatsuya Yasuda. The anime TV series was produced by Toei Doga. It was first broadcast on Japanese TV in 1975. The series lasted for 46 episodes. Steel Jeeg also ran as a manga in several children's publications.

Essentially a CombiningMecha series, it told the story of Shiiba Hiroshi, a car racer who's [[WeCanRebuildHim reconstructed as a cyborg by his father after being mortally wounded in an accident]]. As a cyborg, Hiroshi's capable of transforming into the eponymous Kotetsu Jeeg, a steel robot head that combines with a variety of external parts to form a giant robot and fight the minions of Queen Himika, leader of the Jamatai Kingdom.

The series received a sequel, ''Kotetsushin ("Steel God") Jeeg'' in 2007, taking place fifty years after the original and featuring both new and classic characters.
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!!''Anime/KotetsuJeeg'' features examples of:

* AdvancedAncientAcropolis: The Jamatai Kingdom. It slightly subverts the trope, since they used both advanced technology AND magic.
* AmazonBrigade: The Build Angels
* ArmCannon: The Jeeg Bazooka. It returned in the sequel, transformed into a {{BFG}}.
* ArmorPiercingSlap: With ''spikes'', no less. Ends up taking more than half the face off a MonsterOfTheWeek
* BadassNormal: The Build Angels again, and many, many more
* BareHandedBladeBlock: A subversion. In the ending credits, Jeeg blocks a downward, vertical swing... by crossing its forearms above its head. Of course, given that Jeeg is a robot, hence [[MadeOfIron it is not made of flesh]], it is not worried about the weapon slicing it, and the blade shatters upon impact.
* BatmanCanBreatheInSpace: And so can Hiroshi, although slightly justified since he's a cyborg.
* BeneathTheEarth: The Jamatai Kingdom were a subterranean civilization. They had attempted to conquer Japan in ancient times but they were defeated and fled underground. BigBad Queen Himika definitely harbored a grudge afterwards and longed for revenge.
* {{BFG}}: The Jeeg Bazooka is larger than Jeeg itself in both series.
* BigBad: Queen Himika except in the second half of the original series where she is replaced by the Dragon Emperor (aka Ryuu Teio).
* BoisterousBruiser: Monko of the Build Angels
* ButtMonkey: Don in the original series.
** In the ''VideoGame/SuperRobotWars'' 4koma, it's not uncommon to have Hiroshi have a rivalry of sorts with fellow cyborg [[GaoGaiGar Gai Shishioh]], except [[EverythingsBetterWithSparkles Gai's shinier]]
* CallingYourAttacks: It is a SuperRobot show, after all
* {{Cameo}}: This being a Go Nagai title, there are at least a few. Notably, [[MazingerZ Kouji Kabuto]] and others are visible during a scene in episode 13 of ''Kotetsushin''.
** Also, Kouji in the first episode amongst the cheering crowds.
** ''VideoGame/SuperRobotWars'' ran with this by having Kouji end up fast friends with Kenji in K and L.
* ChainsawGood: The Earth Parts give Jeeg chainsaw arms.
* CombiningMecha: An interesting version: Hiroshi is a cyborg who transforms into a giant head, which then combines with man-made parts to form a HumongousMecha. In the [[{{Revival}} Revival-slash-AlternateUniverse]] sequel Koutetsushin Jeeg, a transforming motorcycle forms the head of the titular mecha, which otherwise functions exactly like its precursor.
* ComicBookFantasyCasting: Hiroshi appears to have been designed after ElvisPresley.
* CoolBike: Kenji's motorcycle from ''Kotetsushin'', which transforms into the head of the new Jeeg
* DefaceOfTheMoon
* DetachmentCombat: Given that Jeeg is able to use magnetism to pull its body parts together or replace them, it also can use them like weapons separately or shoot them (sometimes it did that with just its head!).
* DistaffCounterpart The Build Angels are often considered a gender-swapped version of the [[GetterRobo Getter Team]]
* DoAnythingRobot: Jeeg is ''very'' modular: it can detach and reattach its parts like Lego bricks. Therefore, as long as they can get the right parts to the battlefield, Jeeg can change form to meet any situation.
* DoingInTheWizard: [[spoiler:In ''Kotetsushin'', we find out that Himika and everybody that's presumably mystical are really aliens. The Bronze Bells were the reactors for an ancient ship. The Dragon Emperor isn't mentioned at all, either.]]
** Although possibly a subversion in that the Jama Kingdom are still said to derive their powers from sorcery.
* ExpositoryThemeTune: "Just you watch, the Haniwa Phantoms will be completely destroyed. Run forth, Banban Baban! Big Shooter, swifter than the wind. Build up!"
* {{Expy}}: Himika looks an ''awful'' lot like [[CutieHoney Sister Jill]]. Mecha Don is essentially [[MazingerZ Boss Borot]] on a formula 1 car.
* FallingIntoTheCockpit: Subverted: Kenji's forced to take control of the new Jeeg when a Haniwa Phantom God attacks, but in the next episode it's revealed that he had been intended to be the pilot all along -- the attack simply forced the New Build Base crew to put him into the robot sooner than planned.
* FormulaOne: With Hiroshi and Don being race car drivers they did drive these in the original series.
* GoNagai
** HotbloodedSideburns: And the sideburns, of course, go without mentioning.
* GratuitousEnglish: ''BUILD UP!'' and ''CHANGE CYBORG!''
* GrievousHarmWithABody: (Early on in ''Kotetsushin'', Kenji decides to use one of Jeeg's arms to bludgeon a Haniwa Phantom God to death)
* HeyItsThatVoice: (Hiroshi in both incarnations. His classic form is [[Creator/ToruFuruya Amuro]] [[MobileSuitGundam Ray]], while his ''Kotetsushin'' form is [[Creator/JunichiSuwabe Arc]][[VisualNovel.FateStayNight her]])
* HomeBase: The Build Base for the heroes. An ElaborateUndergroundBase for the villains. And in the sequel, a VolcanoLair.
* HumongousMecha: Partially averted. Jeeg's surprisingly short for a SuperRobot - comparable to the average RealRobot, in fact.
* IAmNotLeftHanded: Many baddies have managed to stop Jeeg from forming, only to realize in horror that Hiroshi doesn't NEED to form Jeeg to kick your ass. CHAAAAAAAAAAAAANGE CYBOOOOOOOOORG!!
* IdiotHero: Kenji
* JumpedAtTheCall: Kenji
* IceQueen: The Princess of Snow from episode 10 of the original series.
* KidHero: Averted. Hiroshi is twenty-five years old.
* KryptoniteFactor: In the original series Steel Jeeg was weakened when making contact with electricity as it affects the magnetic power that binds his body together. Episode 5 also reveals that strong magnetic storms like solar flares prevent him from combining (at least until they made a special coating spray).
* LadyOfWar: Captain Yagyu of the Build Angels, from ''Kotetsushin''.
* LegacyCharacter: (Kenji)
* LostTechnology: Dr. Shiba finds several ancient mysterious magical artifacts and hieroglyphs during an archaeological expedition. His findings provide evidence that the ancient lost kingdom of Jamatai that thrived in the south of Japan has survived, and its Queen Himika is preparing to invade Japan. Of course, his reaction was using that lost technology to get a countermeasure ready (i. e., turning his eldest son into a cyborg capable transforming into a HumongousMecha)
* MadeOfIron: The series name ''is'' "Steel Jeeg"
* MarriedToTheJob: Hiroshi did not knew why his father was always working and he barely talked to his family, and after several years, he decided he did not care about it or his father. When he learnt his reasons, he kind of forgave Prof. Shiba, but his mother still called her husband on it.
* MarshmallowHell: Kenji is the target of this... [[spoiler:from Monko, much to his dismay.]]
* MechaExpansionPack: Jeeg had first the Jeeg Drills, a set of weaponized rockets that doubled like ThisIsADrill, and later it had the Earth, Marine and Sky parts, three sets of armor let the HumongousMecha fighting in land, sea and air, and [[TransformingMecha transforming]].
* MechaShow
* MentorOccupationalHazard: In the original series it happened twice [[spoiler:with the same person.]] Professor Shiba got murdered in the first episode. However [[{{Genre Savvy}} he had the foresight]] to make a backup of his personality in a computer in order to help and guide his son [[{{TheHero}} Hiroshi]] [[spoiler:and then it commited a {{Heroic Sacrifice}}]].
* MetaMecha: In ''SuperRobotRetsuden'' -a KenIshikawa AffectionateParody / {{Crossover}}- of several GoNagai {{Mecha Show}}s, ''Anime/MazingerZ'', ''Anime/GreatMazinger'', ''Anime/UFORoboGrendizer'', ''[[Manga/GetterRobo Getter Robo G]]'' AND ''Anime/KotetsuJeeg'' rode a ''ridiculously, impossibly, massively huge'' TransformingMecha in the FinalBattle.
* {{Miko}}: Tsubaki's part-time work, since her grandmother Miwa "Micchi" Uzuki has become a Shinto priestess
* OlderAndWiser: Micchi was TheChick in the original series but has become TheCaptain by the time the sequel starts
* OmnidisciplinaryScientist: Dr. Shiba. He was an archaelogist, but he could also heal his son's scarred body, make a cyborg, build giant robots and flying vehicles, and transfer his mind into a computer.
* {{Orochi}}: Used as the main antagonists' flying fortress in the original series with a cameo in the new series. It doubles like CoolAirship and AirborneAircraftCarrier.
* RazorWings: The Sky Parts from the original series.
* RedShirtArmy: Subverted in early episodes of ''Kotetsushin Jeeg''. The JSDF -that usually is utterly useless in most anime shows- display competent tactics in their battle against Himika's Haniwa Genjin, and although Jeeg spearheads their attacks, he can't do it alone. They pay a high death toll, of course, but they are not completely exterminated.
* RipVanWinkle: In ''Kotetsushin'', Tatsuko Mido and Monko Saotome of the Build Angels; later, the JSDF forces found within the zone on Kyushu, and Hiroshi.
* {{Robeast}}: The Haniwa Phantoms
* RocketPunch: Dynamite Punch and Knuckle Bomber, the latter using both fists clasped together
** PowerFist: Their fists are also reinforced to cause bigger damage.
* SculptedPhysique: [[CoDragons Asamo's]] body seems done from brown, angled rock, with crystals jutting out of his head and back.
* ShoutOut:
** When Kenji's Jeeg combines with Balba, its arrangement is vaguely reminiscent of ''[[Anime/GreatMazinger Archduke Gorgon]]''. The Haniwa Phantom he defeats in this form, Banshouraguu, also heavily resembles the Great General of Darkness, also from ''Great Mazinger''.
** Did anyone else get a stint of ''[[Anime/MobileSuitGundam a certain slapping vibe]]'' when Kenji's Jeeg kicked Asano in the face?
---> '''Asano''': You kicked me! Not even Queen Himika has ever kicked me!
*** This is also a shout-out to the fact that Amuro Ray's seiyuu was the voice of Hiroshi in the original Jeeg.
** In the final scene of the last episode, ''[[Anime/MazingerZ Kouji, Sayaka and Boss]]'' can be seen walking among the multitude.
** In the final episode of Koutetsushin, one of the Build Angels remarks "Looks like we'll need a blade that smites evil spirits".
* SuperMode: The Koutetsushin Jeeg; overlaps with EleventhHourSuperpower, since it only appears in the final episode.
** Also applies to ''VideoGame/SuperRobotWarsK'', where it can only be accessed as a CombinationAttack
*** Bronze Bell Power counts too. As one of the game's buffet of "Better Mazinpowers", it grants a 25% boost and resistance to damage and an increased critical rate
* SpellMyNameWithAnS: Sometimes romanized as "Steel Sieg", which does make a bit more sense.
* VideoGame/SuperRobotWars: ''VideoGame/SuperRobotWarsAlpha 2'' and ''3'' have the original, while [[VideoGame/SuperRobotWarsK K]] and [[VideoGame/SuperRobotWarsL L]] have ''Koutetsushin''
* TagalongKid: Mayumi, Hiroshi's little sister. She was more endearing and more lovingly naive than her counterparts in other GoNagai works.
* TheOtherDarrin: Creator/JunichiSuwabe replaces Creator/ToruFuruya as Hiroshi in ''Koutetsushin''
* ThisIsADrill The Mach Drills, though the Earth Parts also grant Jeeg a pair of ''drill legs''
* TimeDilationField: One of these was used to [[SealedEvilInACan seal evil in a can]] in the backstory for ''Kotetsushin''
* TransformationNameAnnouncement
* {{Tsundere}}: Tsubaki from ''Koutetsushin'' is a Type B
* TwoGuysAndAGirl: Kenji, Kyo, and Tsubaki in ''Kotetsushin''
* WhamEpisode: Episode 10 of ''Kotetsushin''; [[spoiler:Tsubaki gets possessed by Himika, who then extracts ''both'' Bronze Bells, Kyo reveals he (and the Jama Empire as well) is not only an alien, but also Kenji's uncle AND reveals that Kenji himself is half-alien, Tsubaki descends from a clan of priestesses that have protected Kyo's bloodline, and Build Base gets destroyed. To top it off, Kyo sacrifices himself so that everyone can escape.]]
* YamatoNadeshiko: Miwa as she grows into a graceful and serene {{Miko}} and later TheCaptain who is ''very'' into the whole "core of steel" thing.
** Hiroshi's mother, who gets a CMOA in the original series for [[spoiler: openly calling out Dr. Shiba in his treatment of Hiroshi]]
* YouGottaHaveBlueHair: Flora in the original series.
** Kyo in ''Kotetsushin''
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