[[quoteright:256:http://static.tvtropes.org/pmwiki/pub/images/Eccothedolphin-cover_4299.jpg]]

->''No matter where you go, you know I'll find you\\
No matter where you've been, I'll bring you home''
-->-- [[http://www.youtube.com/watch?v=GON5ieTglEc "St. Gabriel's Mask Vocal Remix"]]

A Creator/{{Sega}} video game series about a [[TimeTravel time-travelling]] [[HeroicDolphin bottlenose dolphin]] who fights space aliens. His friends include a pteranodon, a telepathic strand of DNA, and flying dolphins from ten million years in the future. Or, if you ask some people, a telepathic crystal and various alternate future dolphins. The games were developed by the Hungarian studio Novotrade International, later known as Appaloosa Interactive.

The games feature [[NintendoHard notoriously difficult gameplay]], which focuses on solving puzzles with the ever-present OxygenMeter hanging over the player, and surreal storylines focused on a dolphin's perspective on alien invasions ([[Literature/TheHitchhikersGuideToTheGalaxy that don't involve leaving with a thank-you note]]). Despite the apparent silliness of the premise, the alien (sometimes literally) setting, atmospheric music and minimalist dialogue create a lingering sense of eeriness.

The series was originally for the Sega Genesis/Mega Drive, and began with ''Ecco the Dolphin''. In this game, Ecco's pod was snatched from the seas by a mysterious storm, so he set out to find them, helping other dolphins along the way.

As the storyline went on, it got progressively more bizarre: first, Ecco went to see a blue whale for advice. The blue whale didn't know much, but sent Ecco to talk to the Asterite, the oldest being in the seas, which has the appearance of globes arranged on a double-helix. The Asterite, with no explanation, recognised Ecco and told him it could help him, except it was missing a globe and thus not at full power. The solution: travel to {{Atlantis}} and go back in time 55 million years to retrieve the wayward sphere. In Atlantis, Ecco discovers that the source of the storm was [[HordeOfAlienLocusts a species of hiveminded aliens]] who had lost the ability to make their own food and was thus harvesting from Earth's seas every 500 years.

In the end, Ecco saves his pod and destroys the Vortex aliens - or so he thought.

''Ecco: The Tides of Time'' picked up where the original left off. Ecco finds out from his descendant, Trellia the flying dolphin from ten million years in the future, that the Vortex Queen was NotQuiteDead and had followed Ecco to Earth, whereupon she killed the Asterite and began a takeover. On top of that, Ecco's time-travelling in the first game had split the timestream in two: one where Trellia and her fellows created a paradise for themselves, and one where the Vortex razed the sea and sky, killing the Earth. [[NiceJobBreakingItHero Whoops.]] The second game, then, followed Ecco's adventures as he sought to save the Asterite (also Not Quite Dead) and the good future of Earth. It ended with Ecco vanishing mysteriously into the "Tides of Time"

Then, save for an EdutainmentGame called ''Ecco Jr.'' and [[VideoGameRemake a few remakes]], the series vanished from the face of the Earth for several years.

Its return came in the form of ''Ecco the Dolphin: Defender of the Future'' for the Sega Dreamcast, its storyline written by Creator/DavidBrin, which brought the series to three-dimensions and [[ContinuityReboot completely ignored the universe and storyline that came before it]]. About the only things it had in common with the original series was the protagonist being a dolphin named Ecco, aliens, and time travel. It also introduced a dolphin/human ([[MyFriendsAndZoidberg and whale]]) society, whereas the original games relegated humans to backgrounds in Atlantis and the odd background sunken ship. Fan reaction was mixed.

In ''Defender'', the plot centered around the Foe aliens breaking the timestream by stealing dolphinkind's "[[MacGuffin most noble traits]]" - Intelligence, Ambition, Compassion, Wisdom, and Humility - in the past, before they could unite with humans. It was of course Ecco's job to get these traits back, over the course of three different alternate futures: Man's Nightmare, Dolphins' Nightmare, and Domain of the Enemy.

One was a dying world with polluted water, no humans on account of them having gone extinct in their war against the Foe, and stupid-but-still-sapient dolphins who either worshipped men as a benevolent force which had uplifted dolphinkind from being mere animals and eagerly awaited their return or regarded them as a nasty species that had enslaved dolphinkind. It turns out both factions were probably right.

The next reality happened after Ecco sent back Intelligence and Ambition, turning dolphins into a surly bunch of warlords who drove humans from the seas. Arguably the prettiest section of the game, since the dolphins used a lot of organic-looking technology, and since it includes Hanging Waters, aka "Let's See How Many {{Mythology Gag}}s Can Fit In One Level".

The final alternate reality saw every trait but Humility restored to dolphins. In this one, the Foe took over and turned Earth into {{Mordor}}. And... that's... about it...

All in all, ''Ecco'' is a very bizarre, haunting, frustrating, and strangely charming series. Don't expect to see any more of him in either the Genesis or Defender storyline anytime soon. Unless it's for [[http://blogs.sega.com/usa/2010/04/01/on-these-high-seas-no-one-can-hear-you-scream/ an official]] AprilFoolsDay prank. The creator of Ecco tried to fund a SpiritualSuccessor, ''The Big Blue,'' through Kickstarter, but the attempt was plagued by bad marketing and was only marginally successful.

At present, the first two games are available on various official emulators, such as PlayStation Network, Wii Virtual Console, and Steam. ''Defender'' is only available on the Dreamcast and PS2. ''Ecco'' is often considered a cult classic - the fanbase it has is small, but devoted, and there are [[http://web8.orcaserver.de/ecco/ are]] [[http://www.ecco-darksea.com/ several]] fansites for it on the Web.

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!!This series provides examples of:

[[foldercontrol]]

[[folder: Entire series]]
* BadassAdorable: Ecco, of course, being both a [[HeroicDolphin dolphin]] and the protagonist of an adventure game series, would obviously qualify as this, but it tends towards FridgeBrilliance when you consider that the label BadassAdorable arguably applies to real-life dolphins as well.
* BadFuture: Central to the plot of ''Tides'' and playable in a few levels. ''Defender of the Future'' has ''three'' Bad Futures to go through in total during Ecco's quest to restore the timeline to its proper state.
* BigBad: In all continuities, the resident alien queen serves as the main antagonist.
* BizarreAlienSenses: Dolphins can 'look beyond their eyes with their song'. In Ecco's case it's depicted as summoning a map of the area. There's a level in the second game called Sea of Darkness that requires echolocation to navigate, depicted by lightening the area every time Ecco sings.
* BullFightBoss: The Globe Holder from ''Tides'' has elements of this in the second phase. The great white shark in ''Defender'' is a somewhat straighter example.
* CharacterSong: [[http://www.youtube.com/watch?v=GON5ieTglEc The vocal remix]] of Saint Gabriel's Mask.
* CosmicHorrorStory
* CrapsaccharineWorld: Who knew a video game about dolphins can be so disturbing?
* CrystalSpiresAndTogas: Any time Atlantis shows up.
* EasingIntoTheAdventure: Each game lets you spend as long as you like in the first lagoon; there's always a certain something that kicks the plot off, and the player has control over when it occurs.
* EscortMission: Each game (even the edutainment one) has at least one, though in the original they are optional. They're also not ''too'' bad as escort missions go; in the Genesis games, your charges are invulnerable, and the ''Defender'' ones aren't killable. They're arguably not even true escort missions, since you don't have to protect them or even keep them in sight, they just follow you automatically and unerringly.
** ''Defender'' had an [[GameBreakingBug irritating glitch]] during the most difficult escort mission. You were meant to protect a dolphin so he could lead you to a door and open it for you. Sometimes, after going through a short tunnel, he would manage to swim ''inside a rock'' on the other side and become stuck. Made irritating by the fact that a Power of Sonar gem would have made him obsolete anyway.
* FloatingContinent: In the Good Future of ''Tides''. The flying dolphins say they were "born of the great eruptions", whatever that means. A few also show up in the Hanging Waters level-set in ''Defender''.
* FriendlyPlayfulDolphin: The trope's at its most active in ''Ecco Jr.'', though some minigames in ''Defender'' show the dolphins' playful side. It's nearly absent from the original two games - Ecco's podmate challenges him to see how high he can jump at the start of ''Ecco the Dolphin'', but for the most part the Singers are too concerned with surviving the Vortex assault to be very playful.
* GreenAesop: Like ''SonicCD'', this is one of the rare series where the utopian conclusion is one where technology and nature coexist in harmony instead of taking the "all technology is evil" route common with animal protagonists.
* HailfirePeaks, naturally all with an UnderTheSea twist:
** GreenHillZone: The first level in every game.
** UndergroundLevel: The Undercaves would be the first example.
** SlippySlideyIceWorld: In which Ecco can literally slip and slide around on his belly atop the ice.
** {{Prehistoria}}
** EternalEngine: [[AutoScrollingLevel Welcome to]] [[ThatOneLevel the Machine]]
** The second game also features undersea versions of BubblyClouds (Sky Tides) and {{Mordor}} (Lunar Bay).
* HeroicDolphin: And Ecco, while being the most obvious, isn't actually the only example: dolphinkind in general shows up en masse to kick Vortex carapace at the Asterite's request in ''Tides'', and the Resistance dolphins in ''Defender'''s Dolphins' Nightmare section pull some courageous maneuvers.
* HeroicMime: Ecco does use his voice as a general problem-solving tool, but the player's never privy to anything he says beyond "Queek-queek-queek" and "SQUAAARK!!"
** He also chatters when you press the sonar button out of water in ''Defender.'' Interestingly, one of the scrapped ideas involved being able to see what Ecco's sonar translated to by singing at a mirror.
* HiveMind: The Vortex and Foe alike, though it's clearer with the Vortex.
* HordeOfAlienLocusts: Again, the aliens in both storylines.
* LockedDoor: Summarized by "SEARCH FOR THE KEY-GLYPH" for the first two. ''Defender'' has a few story-related examples scattered around.
* LongSongShortScene: At least one per main game.
** The time travel theme ends in a neat little finishing bar, but only after the song loops twice. Ingame, it's only ever used for about one loop, too short to hear the end of the song. Note this only applies to the version in the first game - the ''Tides'' version loops indefinitely in the sound test.
** ''Tides'' brings us [[http://www.youtube.com/watch?v=2JQ-Hi43pnc Convergence]], which is a medley of just about every major theme in the game. Too bad you only hear it as you're restoring the Asterite... and during the dolphins' [[TheCavalry cavalry charge]] on Lunar Bay that immediately follows that scene. It's not supposed to play there, but they forgot to kick the music over on the zone change - [[NintendoHard as long as you]] [[ForegoneConclusion don't have to reload the level]] and never pause during it, you'll hear it most of the way to the Vortex Queen.
** ''Defender'' has several as well, of the "cutscene too short for them" variety. Behold Master of Forgotten Skills [[http://www.youtube.com/watch?v=8rK4iXfaguA Intro]] and [[http://www.youtube.com/watch?v=xO7YImm-ykY Outro]].
* MakeMeWannaShout: Ecco's sonar gets various weapons-grade upgrades throughout the games.
* TheMaze: At least one in each game, some more frustrating than others.
* NewAge: Let's see, you gotcher dolphins, your New Age-y music, your themes of harmony with the environment...
* NintendoHard: Controller-throwingly so. As to rub salt on the wound, most of the achievements/trophies for the ports revolve around not dying until getting to a certain level and until you beat the game ''three times in a row''.
** On his Twitter, [[WordOfGod Ed Annunziata]] [[https://twitter.com/edannunziata/status/285469578635640832 admitted]] to making the game harder on purpose so that kids who rented it wouldn't beat it in a weekend.
* NoBiologicalSex: The Asterite and its ''Defender'' {{Expy}}, the Guardian.
* OddballInTheSeries: Ecco Jr. All the challenge and peril from the main series is removed, turning it into an edutainment game that focuses on exploration, the reason undoubtedly being to throw a bone to young players who were enticed by ''Ecco'''s apparently kid-friendly premise but repelled by its dark, creepy subject matter and sadistic SurpriseDifficulty.
* PassThroughTheRings: Those Goddamn teleport levels from ''Tides''. Predictably, some of this in ''Defender'' as well, since it's the only 3D game in the series.
* SapientCetaceans:
** Aside from Ecco discussing subjects like alien invasions and lost families with other creatures, [[AnimalTalk including those of other species]], the series also involves solving [[NintendoHard notoriously challenging puzzles]] when playing as Ecco.
** The comic books based on the series more directly portray Ecco as a very clever and resourceful dolphin, even to the point of showing Ecco tricking a jellyfish and a polar bear into attacking each other instead of him.
* SceneryPorn: Many, ''many'' lovely shots of the ocean.
* StalkingMission: ''Defender''. There's a deadly version in ''Tides''.
* SurpriseCreepy: You wouldn't think a series about a dolphin could possibly be this eerie, would you?
* SwordOfPlotAdvancement: The special powers the Asterite gives Ecco in the first and second games, the dolphins' noble traits in Defender.
* {{Threatening Shark}}s: Well, naturally. Sharks are some of the tougher enemies, often taking three to five hits to kill. Ecco himself is transformed into a shark several times in ''Tides'', mostly so he can rampage about the level eating everything... and for an excuse to [[SadisticChoice choose]] between getting munched by OneHitKill sharks or [[DressingAsTheEnemy turn yourself into one]] and proceeding to [[FriendOrFoe get attacked by other dolphins]].
* TimeTravel: In every single game, apart from ''Ecco Jr.''
* UnderwaterRuins: Doubles as SceneryPorn.
* {{Uninstallment}}: ''Ecco Water Wars 2'', Sega's AprilFoolsDay joke.
* {{Xenofiction}}: Even in ''Defender'', where humans are a much more relevant species, the games are told from a cetacean perspective.
* YouCantThwartStageOne: You can't get to the Asterite before the Vortex break it, and you can't restore the Guardian before the Foe make it through.
[[/folder]]

[[folder:[=Genesis/MegaDrive=] games]]
* AmbidextrousSprite: The trope is expected for games of this era, but one of Ecco's sprites are mirrored vertically between up and down movements. The animation transition between up and down movement seems awkward in ''Ecco the Dolphin'', as if Ecco instantly does a 180 degree while facing toward or away from the camera.
** Whether intentional or not, he ''very visibly'' does a 180 spin when turning up-to-down or down-to-up in the 2D bonus stages in ''Defender.'' It's pretty comical, and can result in FridgeLogic if you never noticed this issue in the original games.
* AmbiguousGender: Besides distressed dolphin and orca mothers and Ecco, no one else's gender is specified. Ecco himself isn't revealed to be male until ''Tides''; the first game's manual goes out of its way to to say "Ecco" instead of using a pronoun.
* ArtisticLicensePaleontology: The prehistoric levels of ''Ecco the Dolphin'' include [[AnachronismStew trilobites, pteranodons, and proto-cetaceans cohabiting]].
* AscendedFridgeHorror: One of the main means by which ''Tides of Time'' is DarkerAndEdgier than the first; it simply addresses the darker implications of time travel in further depth than the original did.
** Also, at a couple of points late in the game, you can take a wrong turn and accidentally get [[BalefulPolymorph turned into a Vortex creature]]. Notice how the mechanical floating things look like jellyfish? Now take another look at that creature you've turned into. No real legs, but kind of a tail, a large head, and two short arms where the flippers would be. Yeah. That's what the Vortex Queen would turn all the dolphins into, if it didn't outright kill them.
* TheBadGuyWins: Subverted. [[spoiler:The Vortex are trying to ensure the survival of their species by wiping out the native inhabitants of Earth. Ecco prevents this, and the Vortex end up becoming part of the Earth's natural ecosystem. They give rise to exopods and anthropods such as insects, spiders, crustaceans, and so forth. In the end, the Vortex actually ''succeed'' in their ultimate goal of surviving, just without wiping out the other species of Earth.]]
* BagOfSpilling: You start ''Tides'' with the powers the Asterite gave Ecco in the first game, but they are lost when the Asterite is killed. Which of course occurs just before the first real level of the game.
* BigGood: The Asterite. It's the oldest living thing on the planet, and it's what gives Ecco the means to fight the Vortex.
* BossOnlyLevel: The [[BigBad Vortex Queen]] fights in both games take up their own levels.
** Several of the bosses in ''Tides'' take this form: Moray Abyss and Globeholder are the other major examples.
* CallARabbitASmeerp: The cetaceans refer to themselves as "Singers" and have different names for various animals: Shelled Ones = clams, Hungry Ones = sharks, Eight-Arms = giant octopus, etc.
* CatAndMouseBoss: The final level of ''Tides'''s PlayableEpilogue. The Vortex Queen is heading for the time machine, hoping to paradox you out of existence. You have to get there first and destroy it. Unfortunately, she's currently in an invincible larval state that can [[OneHitKill crush you into paste]] if she sees you. And you need her to open doors for you. [[NintendoHard Good luck.]]
* TheCavalry: Near the end of ''Tides'', the Asterite restores Ecco's powers from the first game and sends you to storm the Vortex base in Lunar Bay. It also summons a bunch of other dolphins, who proceed to [[BadassArmy kick the crap]] out of anything that would otherwise be trying to kill you as you pick your way through the level.
* ChestMonster: The poison clams that look just like healing ones.
* ComicBookAdaptation: In ''SonicTheComic''. Focused on the {{Xenofiction}} angle.
* DarkerAndEdgier: ''Tides'' is noticeably darker than the original, though that's not to say the original wasn't dark.
** The original involves [[spoiler:Ecco using a time machine to change the past and save his pod from an alien race]].
** The sequel involves [[spoiler:Ecco realizing he didn't change the past but simply split the stream of time, allowing for a variety of futures, including [[BadFuture one in which said alien race apparently takes over and the whole place seems to be a technological hellhole]].]]
* DebugRoom: Both ''Ecco'' and ''Tides'' have debug menus accessable by making Ecco face the player, pausing, and entering a certain button combo. Among things accessable are a SoundTest, GodMode invincibility, all the messages in each game with a few DummiedOut extras, a level select, and X/Y-coordinate warps.
* [[DoomedHometown Doomed Home Bay]]: Jump really high to trigger the apocalypse!
* DownerEnding: One interpretation of ''Tides of Time''. You spend the PlayableEpilogue chasing the BigBad through Atlantis, trying to beat her to the Time Machine and destroy it before she uses it to mess up the timeline [[NiceJobBreakingItHero you just spent the whole game fixing]]. [[spoiler: When you get to it, you use it instead. A scrolling title card (set to the [[SugarWiki/AwesomeMusic rather chilling title theme]]) tells you the Vortex Queen beat you there and warped into prehistory, you went after her, and you were never heard from again.]] For another interpretation, see GainaxEnding.
* EarlyBirdCameo: A rather weird variant. The password TRELLIAS skips Ecco to the final boss in the first game.
* EverythingTryingToKillYou: Ecco's enemies are fairly reasonable for the most part, but the prehistoric levels of the first game feature [[GoddamnedBats Goddamned Trilobites]] and giant seahorses who shoot their young at you.
* FlyingSeafoodSpecial: Both dolphins and gigantic medusae.
* GainaxEnding: The other interpretation of the ''Tides of Time'' ending. [[spoiler: It is implied the Vortex Queen, upon arriving in prehistory, got stomped by the local wildlife ([[GoddamnedBats goddamned trilobites]]!), and was unable to dominate Earth's ecosystem, instead integrating into it [[StableTimeLoop and evolving into stuff we already had]]. Not weird enough? According to a {{Word of God}} [[http://ecco-darksea.com/?p=11 interview]], [[GambitRoulette Ecco knew this would happen]] and didn't even bother using the time machine to chase the Queen at all! He used it to go to the time of the [[{{Precursors}} Atlanteans]], for "[[ThePlan specific reasons reserved for the 3rd game]]."]]
* GeniusLoci: The ocean in the good future, according to the future dolphins.
* ImmediateSequel: ''Tides''.
* IWillFindYou: Ecco's motive in the original is to find his pod.
* MarathonLevel: Oh, there have been a few.
** ''Ecco the Dolphin'' has Welcome to the Machine, the five-minute-long autoscrolling monstrosity.
** ''Tides of Time'' features The Eye, a lengthy FetchQuest to repair the Asterite. Lost Orcas also reaches MarathonLevel status in Hard mode due to the sheer numbers of baby orcas to rescue.
* MercyMode: ''Tides'' has a variant: play on normal, and you start on hard. Do badly enough and you get booted back to easy; do well enough, and you'll be back to hard. Also in ''Tides'', the Four Islands StalkingMission will eventually have mercy on you and just give you what you need if you fail ten times, but not before the dolphin gets [[EasyModeMockery more and more frustrated with you]].
* MyOwnGrampa: Variant: while retrieving the Asterite's globe in ''Ecco the Dolphin'', Ecco encounters some proto-cetaceans and accidentally gives them the idea to take to the seas.
* NiceJobBreakingItHero: "You are the Stone that splits the Stream of Time in two."
* NoFairCheating: That handy debug menu? Select the wrong level and you'll get a glitched-up one, often identifiable by lacking a title and having only a password. You can even end up on the title screen but under player control,except that you couldn't stop the rapid side-scrolling action. Then, the game usually froze. You also have to manually turn the music back on after using said menu (pause and press A)
** The second game has a message at the end if you cheat. " Try playing the game without the cheat mode".
* NoOntologicalInertia: The Asterite's powerup only works when it's alive.
* OneHitKill: So many things do this you wonder why they bothered letting you keep the life meter for the last few levels.
* OxygenatedUnderwaterBubbles: These can be gotten from oysters, although sometimes you get a poisoned bubble if you aren't careful.
* PasswordSave: [[SchmuckBait Try filling it out with all N's in the first game.]]
* PlayableEpilogue: ''Tides'' has one ''three levels long''.
* PteroSoarer: There's a helpful pteranodon in the first game. Somehow, without the use of any grasping hindfeet, he manages to carry Ecco over some cliffs.
* RoaringRapids: The underwater type, requiring Ecco to push a rock ahead of himself to bypass the fast currents.
* {{Shapeshifting}}: Specifically, of the Animorphism variety, Ecco can turn into a shark, a seagull, a jellyfish, a vortex creature and [[SerialEscalation a school of fish that can lose and gain members as you go along.]]
* ShoutOut
** To ''Music/PinkFloyd'' of all things with the level title "Welcome to the Machine". Which makes it only natural for someone to create [[http://www.youtube.com/watch?v=MdLKjdW0y4U&feature=related this]].
*** Not to mention Pink Floyd are known for their song "Echoes".
** The Vortex are essentially underwater [[Franchise/{{Alien}} xenomorphs.]]
* TheSkyIsAnOcean: ''The Tides Of Time'' features [[FlyingSeafoodSpecial flying dolphins, a giant flying jellyfish]], and ocean paths in the sky.
* SoundtrackDissonance: ''Ecco Jr.'' features a [[https://www.youtube.com/watch?v=E3pVgEjJuNg particularly unsettling little song]] for a few of its levels that wouldn't sound out of place in a Vortex level in the main series.
* StableTimeLoop: Ecco is sent back in time to find the Asterite's lost globe, but ultimately ends up stealing it from it in the past, and thus being the reason the Asterite doesn't have said globe in the first place. The Asterite itself comes to this revelation when you first meet it, but of course, you're not likely to understand a word it's saying at the time.
* [[WhamEpisode Wham Level]]: "The Library". Up until then you had dealt with a magical talking double-helix, a time machine, and Atlantis, but this is the level where you find out your pod was taken by honest-to-god aliens. And that they'd been harvesting the ocean for centuries.
* WhereItAllBegan: Lacking any other way to chase after the Vortex, Ecco simply uses the time machine to go back to the beginning of the game so he can get captured.
[[/folder]]

[[folder:Defender of the Future]]
* AffablyEvil: Mutaclone in Dolphin's Nightmare.
* AmbitionIsEvil: Ambition is actually one of the dolphins' Noble Traits, but if it's only paired with Intelligence and not tempered by Compassion, Wisdom, and Humility...
* ChekhovsBoomerang: The Power of Morphing, used once at the beginning of the game to slip through a grating [[spoiler:and then again at the end of the game to burrow into the Heart of the Foe]].
* ContinuityReboot: Shares no story connections with the Genesis games, instead returning to the basic theme of a time-traveling dolphin battling space aliens.
* CrapsaccharineWorld: The Dolphins' Nightmare levels are some of the most drop-dead beautiful things to come out of the Dreamcast. It's also not called a nightmare for nothing.
* FauxlosophicNarration: Much of the story exposition in ''Defender'' comes off as this.
* [[HoistByHisOwnPetard Hoist By Their Own Petard]]: [[spoiler:In "Man's Nightmare", the first timeline created by the Foe stealing the virtues, the Foe have been wiped out.]]
* HumansAreTheRealMonsters: In the Man's Nightmare section, when they take over without uniting with the dolphins, instead [[UpliftedAnimal uplifting]] them, enslaving them, and turning Earth into a polluted wasteland during the Foe war. Of course, the dolphins from the Dolphins' Nightmare section are some pretty nasty customers as well, routinely torturing and killing each other and abusing whales, so maybe it's more like Unchecked Dominant Species Are The Real Monsters. Things only go well when dolphins and humans unite as humble equals.
* AnIcePerson[=/=]PlayingWithFire: The Ice and Fire Exalted One, natch.
* {{Invisibility}}: One of Ecco's glyph powers.
* MythologyGag: ''Defender of the Future'' occasionally references the original games, but Hanging Waters in particular seems to be a love letter to them. The level itself is the 3D version of the Skyway, the squid may be referencing both the Eight-Arms and the flying medusa all in one go, and the giant bird towards the end calls the helpful pteranodon to mind, right down to how he's summoned with song.
* NintendoHard: But not quite to the extent of the Genesis games.
* NostalgiaLevel: Includes two hidden sidescrolling levels based on the Genesis games; one is actually ''called'' [[JustForPun Passage from Genesis]].
* [[PoisonMushroom Poison Fish]]: Among the many health-restoring fish there is one specific kind that'll hurt instead of heal you. These poison fish are the only way to heal you from a slow death due to jellyfish poison. If you're poisoned and eat this fish, you won't take damage and your health won't increase, but the poison will be gone. They can also be mildly useful after you learn the Song of Fish. Sharks don't want to eat poison fish, so having a little cloud of them following you around makes a nifty living shield. The downside? Fish are slow, so said living shield is only effective when you don't need or want to swim quickly.
* [[PoweredByAForsakenChild Powered by Two Forsaken Whales]]: The Hanging Waters generator is powered by a couple of enslaved whales.
* SpaceIsAnOcean: The opening cinematic seems to make it apparent that both man and dolphin prefer the "space fetus" method of interstellar travel from the end of ''2001: A Space Oddyssey.''
* SpikesOfVillainy: The Clan. Especially their leaders.
* UpdatedRerelease: For the PS2, which had arguably much better controls, smoothed out some rough patches of level design, had an entirely different sonar map that more resembled the Genesis sonar, and had an interactive Gallery level with concept art and other goodies.
* UpliftedAnimal: The dolphins, having lost their native Intelligence, are artificially uplifted in the Man's Nightmare section.
* WombLevel: The levels leading up to the final boss, being constructed with organic alien tissue. The final boss itself makes this the clearest.
** [[spoiler:TimeLimitBoss: Destroy the Foe Queen's heart quickly, or be [[CruelAndUnusualDeath smothered to death by her own blood]]. If you don't drown first, that is.]]
[[/folder]]
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