->''Long ago, far away in space, there existed a "Fantasy Zone" where a courageous hero called Opa-Opa (the Player) fought in a valiant cause to rescue the "Fantasy Zone" from its enemies.''
-->--'''The opening sentence at the beginning of the game.'''

''Fantasy Zone'' is a horizontally-scrolling ShootEmUp made by {{Sega}}. You control a ship called Opa-Opa, and have to bomb a set number of targets in each stage. Once these are destroyed, a boss will appear, which will have to be defeated to move on to the next stage.

The screen scrolls automatically whenever Opa-Opa moves to the left or right (except during boss battles). Defeated enemies leave behind coins, which can be used to purchase weapon, missile and speed upgrades from the shop, which appears once per level.

''Fantasy Zone'' was originally released in arcades and UsefulNotes/MasterSystem (both versions were developed simultaneously), but later saw ports appearing on the UsefulNotes/{{MSX}}, [[UsefulNotes/{{Famicom}} Family Computer]], UsefulNotes/NintendoEntertainmentSystem (a different port from the Famicom release), [[UsefulNotes/SharpX68000 X68000]] and the UsefulNotes/TurboGrafx16.

The game had a few sequels as well: ''Fantasy Zone II'' for the Master System, ''Fantasy Zone Gear'' (or just ''Fantasy Zone'') for the GameGear, and ''Super Fantasy Zone'' for the SegaGenesis. Additionally, there are two spinoff titles: ''Fantasy Zone: The Maze'' and ''Galactic Protector'' for the Master System. In 2008, a [[VideoGameRemake remake]] of ''Fantasy Zone II'', known [[FanNickname unofficially]] as ''Fantasy Zone II DX'', was issued in Japan as part of a CompilationRerelease, and Opa-Opa is a playable character in ''[[SegaSuperstars Sonic and Sega All-Stars Racing]]''.

Currently, the original game and ''Fantasy Zone II DX'' are both available for download on the Nintendo3DS via the Nintendo eShop as ''3D Fantasy Zone: Opa-Opa Bros.'' and ''3D Fantasy Zone II W'' respectively, adding 3D visuals as well as new game modes and features.

Opa-Opa also showed up like a minor frequent character in ''Anime/RedPhotonZillion'', a SciFi {{Anime}} that Sega co-produced and made games based on.
!!Tropes used in the series:
* AdamSmithHatesYourGuts: Subverted in that items become more expensive each time you buy them.
* AdaptationExpansion: The version of ''Fantasy Zone'' featured on the ''Sega Classics Collection'' (which was originally part of the ''Sega Ages 2500'' lineup) features four new stages and a handful of new upgrades, although they have to be unlocked first.
** The 3DS version adds a mode where you play as Opa-Opa's brother Upa-Upa with a different method of using weapons.
* AmazingTechnicolorBattlefield: The final boss fights in ''Fantasy Zone II DX'' and ''Super Fantasy Zone''.
* AscendedExtra: Upa-Upa, the PaletteSwap brother of Opa-Opa who originally appeared as the player two character in the spinoff titles ''Fantasy Zone: The Maze'' and ''Galactic Protector'', gets his own game modes in ''3D Fantasy Zone: Opa-Opa Bros.'' and ''3D Fantasy Zone II''.
* [[spoiler:BattleInTheCenterOfTheMind: In ''Fantasy Zone II DX'''s best ending, it is revealed that the ''entire game'' was this invoked by Opapa to give Opa-Opa a chance to rid himself of the Nenon entities trying to coax his SplitPersonality of evil into dominance. This also subtly shows if you're on your way to the bad ending; the FinalBoss will be Opa-Opa himself, while you're controlling his evil self.]]
* BittersweetEnding: See [[spoiler:LukeIAmYourFather]].
* BossRush: The final stage in all of the games.
* BulletHell: ''Link Loop Land'' is absolutely ''loaded'' with enemies and their projectiles.
* ContinuingIsPainful: When you die, you lose all of your upgrades, even those you had in reserve. On some bosses, you have pretty much no hope of winning if you lose to them once. Time to start over! ''Fantasy Zone II DX'' alleviates ''some'' of the pain by sending you to a shop that sells only engines if you die to a boss so you can repurchase that extra speed you lost. You're still stuck with the Twin Shot and Single Bomb weapons and no special weapons though.
* CuteEmUp: One of the {{Trope Maker}}s, along with Konami's ''VideoGame/TwinBee''.
* DualWorldGameplay: ''Fantasy Zone II DX'' replaces the "multiple areas" gameplay that the original ''Fantasy Zone II'' had with the "Bright Side" and "Dark Side" mechanic. Dark Side stages are more difficult than their "Bright" counterparts, but rewards you with more money. Depending on where you clear the stages you can get [[MultipleEndings different endings]].
* EarnYourHappyEnding: The only way to reach the [[GoldenEnding Bright Ending]] is to endure your way through most or all the Dark Side levels and still have enough money saved to be able to buy the highly expensive [[EleventhHourSuperpower Drop]] [[SwissArmyTears Tears]] weapon and land it on the FinalBoss, after which [[spoiler:Opa-Opa finally rids himself of all the evil Nenon emotions that have been building up since the first game]]
* EasterEgg: [[spoiler:Holding down the A, B and C buttons when starting a new game in ''Super Fantasy Zone'' will replace the game's music with the soundtrack from the original game.]]
* EleventhHourSuperpower: [[spoiler:You gain a health bar for the battle against the FinalBoss at the end of ''Fantasy Zone II DX'']].
* EndlessGame: ''3D Fantasy Zone II'' adds a game mode called ''Link Loop Land'' which is this.
* EveryTenThousandPoints: Subverted. You do not earn extra lives for score, but you can buy them in the shop (although their price increases each time).
* [[spoiler:FallenHero]]: In one of the MultipleEndings in ''Fantasy Zone II DX'' [[spoiler:Opa-Opa turns evil and casts the Fantasy Zone into chaos, and thus ''VideoGame/SpaceHarrier'' and his white dragon friend Uriah have to save the day]].
* GimmickLevel: ''Super Fantasy Zone'' has two of them. First there's Risscave, a BlackoutBasement where you'll want to buy the Super Lights to increase your field of vision, and then there's Le Picker, which has an electrified floor that will [[HighVoltageDeath kill you]] if you touch it unless you buy the Rubber Boots.
* GuideDangIt: Buying all the engines in the original game gives you unlimited ammo for any beam weapons you buy. Not that the game ever mentions this.
* [[spoiler:LukeIAmYourFather]]: [[spoiler:The FinalBoss of the first game is none other than Opa-Opa's long lost father. This leads Opa-Opa into questioning if his victory [[WasItReallyWorthIt was worth this price he had to pay]]]].
** [[ParodiedTrope Parodied]] in Upa-Upa's ending in Opa-Opa Bros. where he finds that [[spoiler:it was in fact his mom who sent the Menon forces against him because he spent a hefty sum of his brother's savings. This leads Upa-Upa into questioning if his victory was worth this literal price he had to pay]].
* KarmaMeter: The touch screen in ''3D Fantasy Zone II W'' shows Opa-Opa's status, indicating which ending you'll get. He starts neutral, gets angry if you're on your way to the bad ending, and becomes happy if you're on your way to the good ending.
* MirrorBoss: [[spoiler:The FinalBoss of the second game is Opa-Opa's evil personality in physical form who attacks using the same weapons Opa-Opa can use.]]
* MultipleEndings: ''Fantasy Zone II DX'' has three of them depending on which stage types you clear [[spoiler:and whether or not you use the Drop Tears weapon on the FinalBoss]]. The better the ending, the more bonus points you get:
** [[DownerEnding Bad ending]]: Go through more Bright stages than Dark stages. [[spoiler:Opa-Opa's dark side takes over and makes him evil. He spreads chaos throughout the Fantasy Zone, destroying many of his former allies, leading to Space Harrier to try and stop him, though it's implied it's already too late.]] Doubles as a NonStandardGameOver.
** Good ending: Go through more Dark stages than Bright stages. [[spoiler:Opa-Opa never finds out about the truth, but peace is nonetheless restored to the Fantasy Zone.]]
** GoldenEnding: Same as above, but [[spoiler:use the Drop Tear on the FinalBoss]]. [[spoiler:Peace is restored and Opa-Opa finds out about the truth; shedding TearsOfJoy, he vows to never let war occur again.]]
* NewGamePlus: After you get the ending, the game starts again so you can go for a higher score. However, shop prices won't reset, and you restart with only one life.
* NintendoHard: Despite the cute look, the games are extremely unforgiving. There's no continues and extra lives cost money that's needed for weapons [[spoiler: and the good ending in II DX]], which gets frustrating as [[ContinuingIsPainful said weapons go away when dead]]. The controls also take some getting used to.
* NonStandardGameOver: The bad ending in ''Fantasy Zone II DX'' doesn't let you go into NewGamePlus, and instead shows GameOver and ends the game.
* OneHitPointWonder: Though the Master System version of ''Fantasy Zone II'' adds an extendable life bar. In ''Fantasy Zone II DX'', primary weapon upgrades double as an extra hit point as long as it is active.
* PinballScoring: Has reasonable scoring unless you're skilled enough to beat the game. You'll receive a bonus of several million points[[note]]4,000,000 + (10*gold)[[/note]] and [[NewGamePlus start back at the beginning]] where if you're really skilled, you can do it again and again. If you're a god of this game, you can get [[{{Cap}} 99,999,990 points]].
* {{Retraux}}: ''Fantasy Zone II DX'' is built on the System16 hardware the original game used, with the only addition being some extra RAM. It's so authentic that many who see it don't realize that it came out in ''2008'' and not alongside the Master System original. It even works in MAME.
* SapientShip: Opa-Opa.
* SecretCharacter: ''Link Loop Land'' has two: Opa-Opa and [[spoiler:Evil Opa-Opa]], which are respectively unlocked after finishing the game once and finishing the game with the best ending.
* SharedUniverse: With ''VideoGame/SpaceHarrier.''
* SpreadShot: Each game has a variant of it. The original had the 7-Way Shot, one of the most useful in the game. Some of the sequels had the 3-way Shot instead, or alongside it.
* TooFastToStop: The faster engines you can buy make your ship much more difficult to control.
* UnstableEquilibrium: You lose all your powerups when you die, and you have to kill enemies to earn money. Should be pretty easy to see how this comes into play.
* WidgetSeries.
* WorkOffTheDebt: [[spoiler:This is the main reason why Upa-Upa goes into the ''Link Loop Land'']].
* YouKilledMyFather: Opa-Opa's father is killed by the Dark Menon Forces in the opening to ''Super Fantasy Zone''. Opa-Opa then vows to defeat the enemy's mastermind for this reason.