[[quoteright:315:http://static.tvtropes.org/pmwiki/pub/images/Lost_Worlds_Art_02_3893.jpg]]
''Forgotten Worlds'' (''Lost Worlds'' [[MarketBasedTitle in Japan]]) is a sci fi-themed [[ShootEmUp shoot'em ]] by {{Capcom}} released for the arcades in 1988. Notable for being the first game to run on the CP System arcade hardware, which powered the majority of Capcom's subsequent arcade releases for the next few years. ''Forgotten Worlds'' makes use of a rotating control scheme known as "Roll Switch" that allows aiming at eighteen possible directions, something of a novelty back then, as well as a system of supporting satellites that adds a large variety of different weapon options (from {{reflecting laser}}s to napalm bombs). These weapons are purchasable from shops that literally raise from the ground/walls, attended by a girl named Sylphie, using [[FictionalCurrency zennies]] collected from defeated {{mooks}}.

Set in the 29th Century, the story starts with a GalacticConqueror and GodOfEvil and Destruction known as BIOS, who has created eight evil gods and went on conquering and destroying worlds, turning them into husks of their former selves. Eventually, Earth is targeted and suffers the same fate, becoming a warren wasteland known as the "Dust World". The few humans that have survived decide to fight back by raising and training two children into {{badass}} {{super soldier}}s. This works wonders, and the two now adult [[NoNameGiven Nameless]] Soldiers embark on a quest to defeat BIOS.

The game was quite succesful back then, getting ported to many consoles and home computers of the time, including the SegaGenesis (which has to cut a few things, like voiceovers and 2 stages) and later the TurboGrafxCD (which removed 2 player co-op, but included a bunch of bonus features). The main characters were also brought somewhat reguarly in several of the company's {{Crossover}} games.
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!!This game provides examples of:

* [[AnIcePerson An Ice Pers-ehh, Thing]]: Iceman, Stage 7 boss.
* AncientEgypt: The setting of Stages 4 trough 6, the ''[[PyramidPower Pyramid World]]''.
* ArmsDealer: Sylphie.
* AsteroidsMonster: Some enemies in later stages.
* {{Badass}}: The Unknown Soldiers.
* BackgroundBoss: Stage 3 boss, ''War God''.
* BigBad: BIOS, [[InSeriesNickname King of Gods]].
* BlindIdiotTranslation: The ending has some humorous examples.
--> '''Sylphie''': ''Thank you so mach''.
** [[JapaneseMythology Raijin and Fujin]] (Stage 8 bosses) were mangled into ''Laidin and Whodin''.
* BubblyClouds: The ''Sky World'', setting for Stage 7 and 8.
* CaptainErsatz: Laidin and Whodin resemble Raiga and Fuga from ''{{Fist of the North Star}}''.
* TheCameo: Both Unknown Soldiers appear in Ken's stage in ''VideoGame/StreetFighterAlpha 2'' as guests, and they also appear in the Archie ''ComicBook/MegaMan'' comic.
* CoolShades
* ColorCodedMultiplayer: Player 1 in blue and Player 2 in red. However, their sprites are not only different (Player 2 wears a tank top and has a mohawk hair style), their weapons are as well. Player 1 uses a long-range automatic rifle, while Player 2 wields a short-range wide shot.
* {{Crossover}}: "Unknown Soldier 1P" appears as a challenger in the quiz game ''Adventure Quiz: Capcom World'' and its sequel. Sylphie and the Dust Dragon appear in the sequel as well, the former as the "INN attendant" and the latter as one of the three dragon bosses.
** CapcomVsWhatever: Unknown Soldier 1P is one of several {{Assist Character}}s selectable in ''VideoGame/MarvelVsCapcomClashOfTheSuperheroes''. One stage also has [[TheCameo background cameos]] of bosses Raijin & Fujin as well as FinalBoss BIOS. Both soldiers and Sylphie make the jump to playable characters in VideoGame/NamcoXCapcom.
* CrapsackWorld: Earth is a wasteland ruled by a cult of reptilian humanoids and humanity is almost extinct.
* DivergentCharacterEvolution: Inverted in the Genesis port. Player 2 had a different shooting style in the original arcade version, in which he had a short-range wide shot in contrast to Player 1's long-range single shot. In the Genesis version, he operates exactly like Player 1 does.
* {{Dracolich}}: The Dust Dragon at the end of the second stage, a dying rotten dragon with its stomach open and its innards and ribs exposed.
* DualBoss: Raijin & Fujin.
* DubNameChange: The MegaDrive manual changed Sylphie's name to Mirabella. It also changed the names of the War God and Bios into Iron Warlod and War Tyrant, respectively.
* DungeonShop: One has to wonder how Sylphie was able to set up a shop that ''magically raises from beneath the ground'' just as the soldiers come by...
* EnemySummoner: The Dust Dragon generates Reptilian {{Mooks}} from his mouth.
* EternalEngine: The first stage eventually gets into one of these, with giant gears and pipes that release a blast of fire when shot.
* EvilTowerOfOminousness: The ''Tower of Babel'' (a.k.a. BIOS' lair) seen in the background of the Raijin and Fujin BossFight.
** ItsAllUpstairsFromHere: The final stage scrolls upwards instead of sideways, as the soldiers ascend through the Tower of Babel.
* {{Expy}}: [[{{mook}} Two P.]] from ''FinalFight'' was modeled after the Player 2 character of this game. Even Two P.'s name is a reference to him (Two P.= [=2P=]).
* FantasyKitchenSink: Among the evil gods we have representatives from ClassicalMythology (War God), EgyptianMythology (God Rah/Mesketit and the Sphynx) and JapaneseMythology (Fujin & Raijin). And then there are the giant dragons, humanoid reptile cultists, floating martial artists, ice monsters, [[NinjaPirateRobotZombie humongous undead buddhist monks]]...[[MyFriendsAndZoidberg and cyborg Tutankamen]].
* {{Flight}}: The Unknown Soldiers and several human {{Mooks}} fly throughout the game. In the former's case, thanks to gravity equipment.
* GalacticConqueror: Emperor Bios goes across the galaxy, conquering and turning entire worlds into ruined wastelands to be ruled by his subordinate gods.
* GoodOldFisticuffs: The ''huge'' War God throws some heavy punches at the player during the boss fight.
* HomingProjectile: Homing Missiles and Homing Lasers are among the Satellites to purchase.
* KiAttacks: Martial artist-esque {{Mooks}} attack with this.
* LizardFolk: The Reptilian Thugs, early stage {{Mooks}} and religious followers of the War God.
* MacrossMissileMassacre: Not actually missiles, but BIOS has one attack in which he sends a shower of difficult-as-hell-to-avoid homing lasers upon the player.
* MarketBasedTitle: While the original arcade game was titled ''Lost Worlds'' in Japan, all the console ports (including the version in ''Capcom Classics Collection'') were all titled ''Forgotten Worlds'' in Japan, presumably due to trademark issues.
* MindOverMatter: The main power of the first boss, Paramecium.
* MoreDakka: It is a {{SHMUP}}, after all.
** The default WeaponOfChoice given to the soldiers in all their cameos is the machine gun.
* MultiArmedAndDangerous: BIOS sports six arms.
* TheNameless: Both player characters are only known as the "Nameless Ones". This is kept in their cameo appearances, usually going by the monicker of "Unknown Soldier" followed by 1P/2P to identify between them. The Japanese sources have slight variations at times, like "Nameless Super Soldier". The MegaDrive Japanese manual also refers to the 2P soldier as "Mohawk Man".
* OrcusOnHisThrone: When the player reaches BIOS's chamber, he's non-chalantly sitting on his throne.
* OurDragonsAreDifferent: The War God is shown using several western-styled dragons in the intro. One serves as the boss of Stage 2, named the ''Dust Dragon'', which for some reason is half-beaten and missing some patches of flesh (including ''the whole stomach'').
* PhysicalGod: BIOS, the BigBad, is capable of ''creating'' god-like entities by himself.
* PinballProjectile: The Bound satellite.
* PoweredArmor: The soldiers start battle [[WalkingShirtlessScene shirtless]], and get their more iconic armored look after picking up armor upgrades which provides limited protection.
* SaltAndPepper: Player 1 is white and Player 2 is black.
* SegmentedSerpent: Worms in Stage 2, dragons in Stage 7/8 and the boss of Stage 5, ''Centipede''.
* ShockAndAwe: Raijin and Fujin conduct electricity between them as one of their attacks.
* ShoutOut: There's an amusement park in the story mode of ''SNKVsCapcom: Card Fighters Clash'' which is filled with references to the game: it's named "Lost World", its theme music is from the game's first stage, several in-game weapons are exhibited and [[[TheCameo Sylphie herself]] appears as a card seller.
** The alt color for the Unknown Soldier in ''VideoGame/MarvelVsCapcomClashOfTheSuperheroes'' is one to his 2P buddy.
* ShowsDamage: Some bosses, like the War God and Dust Dragon, visibly break apart as the battle goes on.
* SuperSoldier
* VideogameFlamethrowersSuck: The Burner satellite.
* WalkingShirtlessScene: The two characters without the armor pickup, and second-to-last bosses Raijin & Fujin.
* WingedHumanoid: BIOS.
** GoodWingsEvilWings: Subverted. The very evil BIOS has...''white featherly wings''.
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