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1[[quoteright:254:https://static.tvtropes.org/pmwiki/pub/images/tfiv.jpg]]
2
3-> ''Legend of Wings continue.''
4
5A ShootEmUp series by now-defunct Japanese game developer Technosoft, which began in 1983 as an obscure multi-directional overhead shooter. It eventually transformed into a side-scrolling shooter from the third installment onward and became famous among the classic gaming community for its [[AwesomeMusic/ThunderForce memorable synth-rock soundtrack]].
6
7The ExcusePlot puts the player in the shoes of a [[HumanAlien Galaxy]] [[TheFederation Federation]] [[OneManArmy soldier]] piloting the ''[[SuperPrototype Fire Leo]]'' series of starfighters against the overwhelming odds of the cybernetic [[TheEmpire ORN Empire]]. ''Thunder Force V'' [[AndNowForSomeoneCompletelyDifferent shifts the focus to Earth]] wherein humans discover the wreckage of ''Thunder Force IV'''s Fire Leo Rynex ship, which they refer to as "Vasteel", and begin to reverse-engineer its technology for the betterment of mankind. However, things go ''very'' wrong when the Guardian, an advanced A.I. designed for the purpose of reverse-engineering Rynex, goes haywire and decides to use the military technology it created based off of the alien starfighter to try and wipe out the human race--but not before humanity manages to create its ''own'' Vasteel starfighter. ''Thunder Force V'' is also known for having more story than the previous games, which ties together the events of ''IV.''
8
9The sixth installment was trapped in DevelopmentHell for a decade, but was eventually released.
10
11----
12
13The ''Thunder Force'' series spans six games:
14* ''Thunder Force'' (A variety of PC platforms, 1983) -- The first game in the series, and the least well-known. Comprised entirely of overhead stages.
15** ''Thunder Force Construction'' (FM-7 and NEC PC-9801, 1984) -- A port of the above featuring an added level editor.
16* ''Thunder Force II'' (Sharp X68000, 1988) -- Alternates between overhead sections and side-scrolling sections. Rereleased on the Genesis as ''Thunder Force II MD'', with one less overhead-sidescroller pair and more balanced difficulty. ''MD'' itself was ported to Saturn via ''Thunder Force Gold Pack 1'' and to Platform/NintendoSwitch as part of the Nintendo Switch Online Expansion’s Genesis library.
17* ''Thunder Force III'' (Genesis/MD, 1990) -- Completely does away with overhead sections. Ported to the Saturn via ''Gold Pack 1'' and to 3DS as part of Creator/{{M2}}'s ''3D Classics'' series.
18** ''Thunder Force AC'' (Arcade, 1990) -- An arcade port of ''III'' (unusual in that ports generally go from arcade to console and not the other way around) released for Sega's System C-2 arcade hardware, with different 4th and 5th stages. Ported to the Saturn via ''Thunder Force Gold Pack 2'', with an autofire feature that was not present in the original version. and later to the Nintendo Switch as part of M2's ''SEGA Ages'' series of ports.
19** ''Thunder Spirits'' (SNES, 1992) -- A SNES port of ''AC'' (making it a ''port of a port''), with a new stage 5 and stage 8. Notable for being the only ''Thunder Force'' game on a Nintendo platform until the ''3D Classics'' version of ''Thunder Force III'' in 2016. Due to the SNES having weaker processing power than the Genesis and the Sega C-2 board, it has more slowdown than other versions of ''III''.
20* ''Thunder Force IV'' (Genesis/MD, 1992) -- Released as ''Lightening ''(sic)'' Force: [[MarketBasedTitle Quest for the Darkstar]]'' in North America. Ported to the Saturn via ''Gold Pack 2'', with less slowdown and ''III''[='=]s player ship as an unlockable ship, and to the Nintendo Switch as part of the ''SEGA Ages'' series.
21* ''Thunder Force V'' (Saturn, 1997) -- The first game in the series with three-dimensional graphics, and introduces the [[LimitBreak Over Weapon]] system. Ported to the Platform/PlayStation as ''Thunder Force V: Perfect System'', with less slowdown (but reduced visuals) and some {{omake}} content.
22* ''Thunder Force VI'' ([=PlayStation 2=], 2008) -- A whopping 11 years after the initial release of ''V'' and one failed attempt to bring it to the Dreamcast. Due to the low quality-to-anticipation ratio, it was not well received.
23
24----
25!!The ''Thunder Force'' series contains examples of:
26
27* EleventhHourSuperpower: In ''VI'', the Phoenix upgrades to the Syrinx for the final stage, resulting in a few weapon changes, most notably changing the Wave from a rapid-fire shot to a WaveMotionGun like in ''Thunder Force V''.
28* AdaptationExpansion: In ''III'' and ''AC'', Stage 8 is a very short stage before the FinalBoss. It gets expanded into a fuller stage in ''Spirits''.
29* AIIsACrapshoot: Main plot of ''V''. Humanity built a super computer named Guardian to study the wreckage of Rynex, the 4th game's Fire Leo. It then built a large fleet of starships based on the data. Then Guardian's AI damper program mysteriously disappeared and it turned against humanity with said fleet. [[spoiler:Guardian is still loyal to humanity. Khaos (the BigBad from the previous game) escaped its destruction by transferring its program to Rynex, which deleted the AI damper after Guardian accessed its history logs. In the end, Guardian reveals that it helped humanity by purposefully spreading its forces thin and leaving critical flaws in its tactics, allowing the protagonist, Cenes Crawford, to destroy the fleet.]]
30* AllYourBaseAreBelongToUs: In Stage 4 of ''VI'', the Galaxy Federation's home planet is under attack by the ORN Empire. You must get in and stop the ORN Empire from destroying the planet.
31* AlliterativeName: ''Thunder Force V''[='=]s Armament Armed Arm (also known as "A3") and ''Thunder Force VI''[='=]s Barbaric Berserk Beast (a.k.a. "B3")
32* AlwaysAccurateAttack: The Free Range in ''V'' worked like this -- anything entering the green wireframe area would be in for a world of (unavoidable) hurt.
33* AndNowForSomeoneCompletelyDifferent: ''V'' initially comes across as this, as it's set around 22nd Century Earth, though the story reveals a considerable connection to the events of ''IV''. Especially since Vasteel ''is'' Rynex [[spoiler:and that the Guardian was compromised by Khaos.]]
34* ArrangeMode: The ''SEGA AGES'' version of ''Thunder Force IV'' has a "Kids" mod of the game that adjusts weapon power and does not confiscate your current weapon when you die.
35* ArtificialHuman: Cenes Crawford, PlayerCharacter of ''V'' is actually a clone of a dead AcePilot. Same as C [=CTNs=] C of ''VI''.
36* AttackDrone: The [=CLAWs=] for the Fire Leo series.
37* AwesomeButImpractical: In ''V'' and ''VI'', you can make your ship do rolls. It does nothing but [[RuleOfCool look stylish]]
38* AwesomeButTemporary: In ''V'', when you reach Stage 5 you gain access to the Brigandine module, an attachment to a new ship you also get at the same time, the Vambrace. The Brigandine has infinite-use Twin Shot and Back Shot [[LimitBreak Over Weapons]] that can easily shred any non-boss enemy. However, it also has a LifeMeter, and once it runs out or you proceed to the next stage, it's gone and you have to go on in just the Vambrace, which is still an upgrade over the Gauntlet but does not have the blatantly overpowered weaponry of the Brigandine.
39* BattleshipRaid: The Cerberus in ''III'' and ''VI''.
40* BigBad: Khaos is a pretty impressive one. After harassing TheFederation for two games, we've finally blown it up in the third. Only to find its program was transferred to a secondary system in the fourth. [[spoiler:And it's even revealed [[HijackedByGanon to be the one behind Guardian's rampage]] in the fifth.]]
41* BigWhat:
42** The name of the BGM for the second half of Stage 1 in ''IV'' is ''What?''.
43** [[PlayingWithATrope Where!]]: The track title for the second half of the fourth stage of the same game.
44* BittersweetEnding:
45** ''Thunder Force IV'' has [[spoiler:the Rynex getting crippled while escaping the explosion following the defeat of Khaos and being abandoned to drift in space, while the scientists of the Galactic Federation admit that sending it off to battle was a huge mistake on their part. The "sweet" aspect comes to fruition in VI, as Earth and the Galactic Federation ultimately form an alliance because of Rynex ending up in Earth's hands and spawning Vasteel technology.]]
46** ''V'' has [[spoiler:Cenes Crawford, pilot of the Gauntlet/Vambrace, learn that the Guardian was on Earth's side all along, and that it did what it could to help her fight Khaos, who was behind the corruption. Cenes destroys herself and the Vambrace so that another incident like that can not happen again. As it turns out in ''VI'', however, ORN Empire ends up finding its way to Earth, forcing Earth to resurrect Vasteel technology.]]
47* BlindIdiotTranslation: Many, many examples.
48** "This is Exceliza, I want to fly now!"
49** "Mission accomplished. I'll be right back."
50** The boss subname for A3 in ''V'' ("It died three times, and was reborn twice") is often accused of this because it sounds odd at first -- [[GameplayAndStoryIntegration it's because A3 transforms into three different modes during the fight]].
51** The Greek mythology-themed planet names in ''III'' are screwed up too, namely Seiren (Siren), Haides (Hades), and Ellis (Eris).
52* BoringButPractical: Twin Shot and Back Fire, the only weapons you don't lose when you die.
53* BossOnlyLevel: The final level of ''IV''.
54* BossSubtitles: ''V'' and ''VI''.
55* BossWarningSiren:
56** In ''II'', a siren plays when encoutnering a midboss in a horizontal-scrolling segment. A lower-pitched and more distressful-sounding one plays when facing the stage's endboss.
57** In ''III'', bosses are preceded by a siren and the word "EMERGENCY" scrolling across the bottom of the screen.
58** In ''IV'', a siren sounds when a boss battle is about to begin.
59** In ''V'': "ALERT! The enemy is (approaching fast) / (dead ahead)! Code Name: <boss name> - <boss description>". The FinalBoss mixes it up by [[spoiler:having the usual alert screen play out, only to suddenly be replaced by "ALERT!" repeated across the screen.]]
60** In ''VI'', you get a siren and your ship's computer alerting of the boss in [[GratuitousForeignLanguage Tangut]], followed by the name and description of the boss, both in English and Mongolian.
61* BreakThemByTalking: In the "Bad" Ending of ''VI'', a message from ORN Faust is played calling for Earth's surrender. It contains many parallels with Guardian's Last Message in ''V'', albeit using bleaker analogies to make its points.
62* ConvectionSchmonvection: The fire planet levels throughout the series.
63* CoolStarship: The Fire-Leo series for the Galactic Federation and the RVR series for Earth.
64* CrosshairAware: The Sky Raid stage in ''IV''
65* DarkReprise: The Bad Ending of ''VI'' [[EasyModeMockery (which can be achieved by playing the game on Kids or Easy mode)]] is this to the "Last Letter" from ''V''.
66* DeathIsASlapOnTheWrist:
67** The default ship in ''VI'' doesn't lose its weapons when you die.
68** The "Kids" mode in the ''SEGA AGES'' versions of ''AC'' and ''IV'' prevent you from losing your weapons upon death.
69* DifficultyByRegion:
70** The Japanese version of ''AC'' (which is the version used in ''Thunder Force Gold Pack 2'') is more difficult than the later World (dubbed "New Version" in the Sega Ages version of AC) release, Mostly, everything has twice as much health.
71** ''Lightening Force'' is easier than the Japan version of ''IV. Enemies and bosses have less health, bosses telegraph their attacks more and are not as fast and aggressive, and this version adds a cheat where the player can start with 99 lives by setting their life count to 0 in the option menu.
72* TheDragon: ORN Faust is this in ''IV'' and ''VI'', serving as the penultimate boss in both of those games.
73* DuelingPlayerCharacters:
74** ''Thunder Force V'' has you fighting the Vasteel Original / Rynex.
75** ''Thunder Force VI'' has you fight Vasteel Nocht, which assembles giant versions of the Styx, Rynex, and Gauntlet. Notably, ''VI'' has the Rynex-R as an unlockable ship, making it the closest in the series you can get to a MirrorMatch.
76* EarlyInstallmentWeirdness:
77** The first game, released in 1983, has no side-scrolling stages and plays more like a combination of ''VideoGame/{{Xevious}}'' and ''VideoGame/TimePilot'', and is similar to 1985's ''VideoGame/RaidOnBungelingBay''. It also features a PublicDomainSoundtrack (Rossini's William Tell Overture) that plays throughout the entire game. The second introduces side-scrollers and the third game does away with overhead stages entirely.
78** The second game, the first one with side-scrolling segments, has no speed change function.
79* EasierThanEasy: ''Thunder Force IV'' has an Easy difficulty level, and the ''SEGA AGES'' version on Nintendo Switch adds a "Kids" version of the game which does not take away your equipped weapon upon death and still has the four difficulty levels available; thus, you can play the Kids version on Easy.
80* EasyModeMockery:
81** ''II MD'' has an easy difficulty setting, Training. It ends the game after you complete the stage you choose to start at. Consequently, because the stage select only goes up to stage 3-1, you cannot play any higher stages with it.
82** The EasierThanEasy difficulty level in ''VI'' is called "Kids" difficulty. Apparently, not wanting to play the game at the intended difficulty means that [[{{Manchild}} one is as mature as a child]]. Furthermore, clearing the game on this difficulty results in a bad ending.
83** The ''SEGA AGES'' versions of ''AC'' and ''IV'' have an ArrangeMode where dying does not take away any of your weapons, but like ''VI''[='=]s lowest difficulty, it is called "Kids" mode.
84* EveryTenThousandPoints: The series is known for cranking out tons of extends.
85* EvilCounterpart: [[spoiler:The Vasteel Original (the Rynex) in ''V'' and Vasteel Nocht in ''VI''.]]
86* ExcusePlot: Most of the series. Though it starts getting elaborated upon starting with ''IV'', which continues further in ''V.''
87* FallenHero: The player's ship in ''IV'', "Rynex", comes back in ''V'' as a SequentialBoss that you have to fight against and destroy.
88* FanSequel: ''Broken Thunder'', released after ''V'' and before ''VI''. The good news: Hyakutaro Tsukumo worked on the soundtrack. The bad news: It was so ill-received that it is theorized that Tsukumo's involvement with it was why he was left out of ''Thunder Force VI''[='=]s soundtrack.
89* FeaturelessProtagonist: Averted in ''V'', which places the player in the pilot's seat of female ace Cenes Crawford.
90* FetusTerrible: The ORN Emperor in ''VI'' is an extremely ugly and monstrous infant with 3 eyes and varying number of irises in each of them. Apparently, the design was lifted from a character from a manga the project director had once drawn.
91* FinalBossPreview: ''IV'' had Versus at the end of the BattleshipRaid level. Your team of ships try to destroy it and get their asses completely handed to them, forcing the remaining members of your squad to resort to giving you the MidSeasonUpgrade. Thankfully, you get your revenge in the final level.
92* GameBreakingBug: Sometimes when playing ''Thunder Force VI'' enemy bullets will either be pixelated or just plain vanish. For example, when fighting the [[FinalBoss ORN Emperor's]] [[OneWingedAngel final form]], his fireball-like attacks will suddenly become invisible.
93* GenreShift: Across two games; ''Thunder Force II'' adds some side-scrolling areas to go with ''[=TF1=]''-style overhead areas, and ''Thunder Force III'' does away with overhead areas completely.
94* GodzillaThreshold: The impending invasion of the ORN forces in ''VI'' prompted Earth to reengineer Vasteel technology and even rebuilding the Sword Fleet. The same technology Cenes Crawford [[spoiler:and the Guardian]] tried to seal in ''V.''
95* GratuitousForeignLanguage: ''Two'' in ''Thunder Force VI'' -- an obscure and extinct language spoken in the Western Xia dynasty (now China) called Tangut, and Mongolian.
96* HappyEndingOverride: ''V'' overrides the BittersweetEnding of ''IV'', [[spoiler:revealing that Khaos transferred itself into Rynex, remaining dormant even after Earth discovers "Vasteel." It's when the AI known as the Guardian attempts to access the history logs that Khaos truly sets the game's events into motion]].
97* HarderThanHard: "Very Hard" in ''Thunder Force II'' for the Sharp X68000, "Mania" in ''III'', "Master" in the [=PlayStation=] version in ''V'', and "Maniac" in ''IV'' and ''VI''.
98* HardLevelsEasyBosses: Many bosses in ''III'' die within seconds of exposure to your weapons, especially the [[GameBreaker Sever]]. In contrast, the stages themselves have many deathtraps that demand twitch reflexes and ''VideoGame/RType''-style memorization.
99* HistoryRepeats: In the bad ending of ''V'', this trope is why [[spoiler:the Guardian begs Cenes to destroy the Vambrace that she's piloting. However, she's unable to because it's too crippled to self-destruct.]]
100* {{Homage}}: Some of the boss names in ''Thunder Force V'': Music/DeepPurple, Music/IronMaiden, and A3 (for Alabama 3).
101* HopelessBossFight: Versus for stage 5 in ''Thunder Force IV''.
102* ICannotSelfTerminate: The Guardian, whether because it's designed that way [[spoiler:or because Khaos has compromised the AI. This is also why the Guardian, which is still loyal to mankind, intentionally makes tactical errors and implicitly goads Cenes Crawford into SuicideByCop.]]
103* ILetYouWin: [[spoiler:The Guardian]] in ''Thunder Force V.'' Cenes Crawford [[spoiler:in her last message]] even lampshades this by stating that had it not done so, the odds of ''just surviving'' those battles wasn't even in single digits.
104* InsignificantLittleBluePlanet: The Galaxy Federation would only know of the existence of Earth thanks to Rynex finding its way there by chance [[spoiler:and the crew of Rynex vouching for the trustworthiness of the people of Earth]]. Granted, Earth forces do not disappoint and end up becoming TheCavalry for the Galaxy Federation in ''VI'', arriving just in time when the ORN Empire lays siege on the Federation's capital planet.
105* InterfaceScrew:
106** Normally when your shots impact against objects, the explosions are red if they cause damage, and blue if they do not. This However, in ''IV'', the Blade weapon, as well as the Snake's floor and ceiling explosives, release red explosions regardless of whether your shots are causing damage. This means you can spend 5 or so minutes against a boss using these weapons and wondering why it won't die, then switch to another weapon and realize you were not shooting its [[AttackItsWeakPoint weak point]].
107** In ''V'', the BossWarningSiren glitches out [[spoiler:upon encountering the Guardian.]]
108* InternalHomage: ''Thunder Force VI'' has many references to past games in the series. [[Administrivia/TropesAreTools Perhaps too many.]]
109* ItsUpToYou: ORN's forces are so much greater than the Galaxy Federation's that if the Fire Leo fails, their regular forces won't stand a chance.
110** In ''IV'', other Galactic Federation fighters team up with you to take on the Cerberus battleship before being cut to ribbons in the boss fight immediately following.
111** In ''V'', your character leads a squad of RVR-01 Gauntlets (named "Thunder Force", incidentally). Later on, after the battle at Babel only the [[PlayerCharacter protagonist]] takes on the Guardian as only one model of the RVR-02 Vambrace is operational; [[AllThereInTheManual Cene Crawford's report]] mentions that her squadmates essentially drew straws.
112* JustifiedExtraLives: ''Thunder Force V'' explained it as a cloning system called "Circulate Death".
113* KaizoTrap: The boss of Stage 9 in ''IV'' will try to ram you during its death animation.
114* {{Leitmotif}}: ''[[https://www.youtube.com/watch?v=vkC3kY0TdoM And the Wind Blew All Day Long]]'' for Styx, ''[[https://www.youtube.com/watch?v=-VzLxWBho-8 Lightning Strikes Again]]'' for Rynex, and ''[[https://www.youtube.com/watch?v=mL3Aq5hmqjE Beginning of War]]'' for Vambrace. In ''VI'', [[TheDragon ORN Faust]] has [[https://www.youtube.com/watch?v=PgNaVzWRP6Y KIN3-COOL]], which is a remix of [[BigBad Director Cool]]'s theme from ''Segagaga'', or if you use the Rynex or Syrinx, [[https://www.youtube.com/watch?v=g3hbJB3JY0A KIN3-CERB]], which is a remix of "His Behavior Inspired Us with Distrust" from ''III''.
115* LayeredMetropolis: Stage 3 of ''V'', Human Road.
116* LaterInstallmentWeirdness:
117** In the fifth and sixth games, Twin Shot and Back Shot are no longer replacable weapons, that is, they cannot be replaced by another weapon that you pick up. The most that is done to them is that in ''V'', they get replaced for plot reasons in the second half of the game.
118** Unlike the prior four games, ''VI'' gives you all of your weapons at the start and does not take any of them away upon death, but only if you're using the default Phoenix ship or its EleventhHourSuperpower counterpart, the Syrinx.
119* LethalLavaLand: The fire planet levels throughout the series.
120* MechaExpansionPack: Brigadine booster for Gauntlet and Vasteel Original's own much-bigger and much-more-bizarre add-ons in V; in VI, Vasteel Nocht would "mimic" player ships from previous instalments this way as well.
121* MidSeasonUpgrade:
122** The player's RVR-01 Gauntlet upgrades to the RVR-02 Vambrace in ''V'', which has superior weapons. As well as the [[MechaExpansionPack Brigandine module]], a [[SwordOfPlotAdvancement super durable part that supplies unlimited use]] of SecondaryFire. Although the Brigandine [[TooCoolToLive only lasts for one stage]].
123** Also happens in ''IV'' where the Rynex starts off functionally similar to the Styx, but at the halfway point it gets fitted with the [[WaveMotionGun Thunder Sword]] and gains spherical CLAW drones that serve as capacitors for the Thunder Sword.
124* MultipleEndings: ''IV'' just changes what song plays during the ending depending on the difficulty, but ''V'''s ending is decided by whether you beat the final boss fast enough, and ''VI'' has three endings depending on what ship and difficulty you chose and whether you used a continue.
125* NoodleIncident: Cenes Crawford's previous "deaths" in ''V.''
126* NostalgiaLevel:
127** Stage 5 in ''Thunder Force AC'' and ''Thunder Spirits'' is a recreation of ''Thunder Force II''[='=]s Stages 5-2 and 6-2 (4-2 and 5-2 in the Genesis/MD port, respectively).
128** ''Thunder Force VI''[='=]s second stage, the fire stage, looks a lot like Gorgon from ''Thunder Force III'', being a LethalLavaLand with fire pillars and even a OneUp in the exact same fireball hazard.
129* OffscreenMomentOfAwesome: We never get to use the Phoenix's Brigandine in ''VI'', which was featured in the opening.
130* OneManArmy: In most of the games, but deconstructed in ''V''. As it turns out, the reason Cenes Crawford was even able to take on the Guardian's forces, let alone the Sword Fleet ''at all'' [[spoiler:was because the Guardian, still loyal to humanity despite Khaos compromising the AI's control, intentionally pursued HollywoodTactics and left open gaping holes for Cenes and her squadmates to exploit. All so she could commit what amounts to a SuicideByCop.]]
131* OneWingedAngel: Gargoyle Perfect in ''VI''.
132* OneWomanWail: The [[https://www.youtube.com/watch?v=XNtb2RSg2SY opening]] and [[https://www.youtube.com/watch?v=HbAvc_MRy0A ending]] of ''Thunder Force VI''.
133* OneWorldOrder: Earth in ''V'' and ''VI'', though its armies crumble before the rogue Guardian AI in the former and are struggling against the ORN Empire in the latter.
134* OrbitingParticleShield: The Craw powerups soak enemy bullets and can fire a few of their own.
135* PlayerMooks: You can unlock the Rynex-R, the main fighter of the Galactic Federation, in ''VI''.
136* PrecisionFStrike:
137** In ''Thunder Force II'', when you lose your last life, the robo-voice exclaims "Shit!".
138** In a similar vein, the pilot in ''Thunder Force AC'' complains "Oh, dammit!" when losing his second-to-last life.
139* PromotedToPlayable: The Mass Production Styx, seen as NPC allies in ''Thunder Force IV'', was backported into the ''SEGA AGES'' version of ''Thunder Force AC'' as a playable ship.
140* RaisingTheSteaks: [[ShoutOut Iron Maiden]] from ''V'' is an undead animal of sorts (complete with flies, rotting flesh, and blood). Its description? "It was dead, but alive at the same time".
141* RealTimeWeaponChange: You can instantly change weapons at any time by pressing the weapon change button, or the button of the weapon you want in ''V'' if Direct Control is enabled.
142* RecurringBoss: A good chunk of the bosses in ''III'' and ''V'' get another shot in ''VI'', but the most recurring boss character in the series is Gargoyle, who is the first boss of ''III'' and its adaptations, ''IV'' (as Gargoyle Diver) and ''VI'' (as Gargoyle Perfect).
143* RecurringBossTemplate: Gargoyle starting with ''III'', and ORN Faust in ''VI''. In addition, the Gaia Beast from the second game's third horizontal stage comes back as Dust Egg, the seventh boss of the fourth game. The main difference is that Dust Egg has a second, ''much'' more active phase where it rises up on some sort of tendril and lunges all over the place.
144* RedshirtArmy: The Galactic Federation in ''IV'' and ''VI''
145* ReportingNames: In ''V'', the people of Earth don't know that the wayward ship that landed on their planet is called the Rynex, so they christen it as ''Vasteel''.
146* RoaringRampageOfRevenge: Halfway through ''IV'' this becomes the motivation for Rynex's pilot for going after Faust.
147* RoboSpeak: The voice that announces power-ups.
148* {{Roboteching}}: The [[MacrossMissileMassacre Hunter]] weapon. Your ship shoots out blue energy balls of doom that home in on the enemies.
149* SecretCharacter:
150** Styx is unlockable in the Saturn and Switch versions of ''Thunder Force IV''. In both case, you need to beat the game once on the stock settings with the former also require the player to input a code [[note]]Press '''st'''art while holding '''Y''' and '''X''' before starting the game[[/note]] after the unlock condition is met.
151** The Sega Ages versions of ''AC'' adds three additional player ships unlocked in the same way: Rynex, Rynex with the Thunder Sword attachment and the Mass Production Styx, which differ from regular Styx in its ability to speed up the rotation of its CLAW drones.
152* SequelHook: The Good Ending in ''VI'' [[spoiler: shows a new Fire LEO ship flying off into the horizon followed by the words "Thunder Force VI: The Legend of Wings - ToBeContinued". Whether ''Thunder Force VII'' will happen or not has yet to be seen, though.]]
153* SequentialBoss: Many of them. Of note is Armed Armament Arm from ''V'', who has three different forms. Same applies to UNKNOWN II, the FinalBoss (effectively [[spoiler:a FusionDance of the Khaos and Guardian AIs. With [[BigBad Khaos]] in charge]]).
154* SingleBiomePlanet: The sole exception is ''V'', which occurs on Earth. The ocean planet in ''VI'' is a post-global warming world and you will get to pass the submerged city at one point. The jungle is really an abandoned space colony, with overgrown forests having overtook residental area.
155* SoundtrackDissonance: ''VI'' has unusually cheerful music for [[https://www.youtube.com/watch?v=-qx69cCE7Vs Stage 5]] (a BattleshipRaid against the ''Cerberus 2'') and [[https://www.youtube.com/watch?v=S0SyGhQLrDQ Stage 6]] (the ORN stronghold), if you're using the Rynex-R or Syrinx. Both tracks are by Motoaki Furukawa, who composed several ''VideoGame/{{Gradius}}'' soundtracks that also include holiday-esque final stage music.
156* SpaceZone: ''VI'' plays with this by having the background move around with no effect on gameplay at times.
157* SuicideByCop: [[spoiler:The Guardian]] in ''V'', in order to save humanity [[spoiler:from Khaos/Vasteel's influence]].
158* SuperTitle64Advance: The [=PlayStation=] port of ''Thunder Force V'' was called ''Thunder Force V: '''P'''erfect '''S'''ystem''.
159* ThemeNaming: The ship names: Styx, Rynex, Syrinx as well as the Gauntlet, Vambrace, and Brigandine.
160* TooAwesomeToUse: ''III'' (on Normal and Easy), ''IV'', ''V'', and ''VI'' (Rynex-R only) all take away your current weapon upon death, which can lead to the player having to use inferior weapons in difficult spots if they want to keep that awesome-but-difficult-to-get weapon.
161* TransformingMecha: A3 ([[FunWithAcronyms Armament Armed Arm]]) and Guardian's Knight from ''V'' and B3 (Barbaric Berserk Beast) from ''VI''.
162* UnstableEquilibrium: From ''III'' onwards, dying takes away your current weapon. This can lead to situations in which you [[TooAwesomeToUse avoid using the most effective weapon for the situation, lest you die and lose it]].
163* VersionExclusiveContent: ''Thunder Force AC'', an arcade port of ''III'', replaces the Haides and Ellis stages with new stages, one being some sort of space junkyard and the other being a [[NostalgiaLevel replica]] of Stages 5-2 and 6-2 from ''Thunder Force II'' (4-2 and 5-2 in the Genesis/MD version). ''Thunder Spirits'' adds another modification in the form of a new capital ship in Stage 6 in place of the original Cerberus.
164* VideoGame3DLeap: As a presentation upgrade starting with ''V''.
165* WaveMotionGun: The Rynex's Thunder Sword.
166* WeaponizedExhaust: The Mass Production Styx in ''SEGA AGES: Thunder Force AC'' can use its engine exhaust to attack enemies by pressing the speed change button. Using it to destroy enemies nets a lot more points than using your proper weapons.
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