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''Spartakus and the Sun Beneath the Sea'' is the English title of the French animated series ''Les Mondes Engloutis'' ( or "The Engulfed Worlds"), best known by American viewers as that trippy little series that ran on {{Nickelodeon}} for two years (1985-1987). You know, the one with the opening theme song sung by Menudo in Season 2.

The series concerns a lost city named Arkadia, whose ancient civilization escaped a great cataclysm by moving underground. Today, most Arkadians don't even know that life continues on the surface (thanks to the machinations of the ancients), and they would get on just fine under the light of their artificial sun Tehra (Shagma in the original French) - except that said sun is dying. [[OhCrap Oh bugger]]...

With no other choice, a few Arkadian children defy the laws and enter the archive, using the knowledge about the surface they find there to create a messenger, Arkana, and send her for help. Together with the two talking pangolins Bic and Bac, she makes it to the surface in [[LivingShip Tehrig]], and finds two ordinary human children, Matt (Bob in the original) and Rebecca, willing to go back with her. Unfortunately, Tehrig (Shagshag in the original) is captured by the Pirates of the Seas before reaching the portal back. They are eventually freed with the help of the wandering warrior Spartakus, but by then they are hopelessly lost, and have to wander the various worlds beneath the sea to find a way to Arkadia before it's too late.

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!!This series contains examples of:

* AdultsAreUseless: In the beginning, when the adults of Arkadia are unwilling or unable to do anything about the upcoming apocalypse, forcing the children to act.
** Later on in the first episode, Rebecca invokes and {{Lampshades}} this trope when talking Matt into going with Arkana instead of taking her to the authorities -- claiming that the adults would take Arkana and do experiments on her, trying to figure out her history, and by the time they got around to ''maybe'' send help to Arkadia, it would be too late.
* AnnoyingYoungerSibling: Rebecca is occasionally this to Matt.
* ApocalypseHow: Arkadia escaped one cataclysm by moving underground. Now they're on the verge of another one.
* ArmlessBiped: Inverted by the Arkadians, who have no legs and a rounded bottom.
* ArtificialHuman: Arkana herself.
* {{Atlantis}}: The Arkadians are hinted to be the last survivors from here.
* BeneathTheEarth: Arkadia and its inhabitants.
* BookEnds: In the first episode when Matt and Rebecca join, they mention they need to be back in time for dinner. At the end of the last episode, when Tehrig drops them off home, their mother is calling them to dinner.
* CainAndAbel: Spartakus has a younger brother named, I kid you not, Rainbow. However, there's no sunshine where he's involved, as he's the evil ruler of a kingdom and a slaver. And he wants nothing more than to see his older brother in chains.
* CheerfulChild: Rebecca, with an extra side-order of PluckyGirl.
* ClipShow: Two of them; one involves a MadScientist sending Tehrig back in time through the group's previous adventures; the other has Tehrig lose his memory and think he's the Pirate ship, upon which the others recount some of their encounters with the Pirates, in the hope of getting him to snap out of it.
* CompletelyDifferentTitle: The English dub goes from ''Les Mondes Engloutis'' ("The Engulfed Worlds") to ''Spartakus and the Sun Beneath The Sea,'' elevating Spartakus to main character.
* TheDividual: Bic and Bac, of the Twindividual variety.
* DubNameChange: Easy enough to understand why they changed "Shagma" and "Shagshag" to "Tehra" and "Tehrig," and since the Pirates all have pun-based names in the original French, it's no big surprise that they were changed as well (apart from Massmedia, whose name works equally well in both French and English).... but why did they change "Bob" to "Matt"?!
* EnsembleCast: Despite what the English title would have you think, all the major characters had roughly the same amount of screen-time and equal importance to the plot.
* [[EternalEnglish Eternal French]]: The civilizations of the surface have been out of contact with the civilizations of the strata for millenia. So naturally, everyone understands each other just fine.
* ExpositoryThemeTune
* FunnyAnimal: Bic and Bac, again. They're mostly there for [[PluckyComicRelief comedy relief]], but do get to play important parts in the plot from time to time.
* GladiatorRevolt - Spartakus (as might be guessed from his name) is an ex-gladiator who escaped slavery following a revolt.
* HollowWorld - The various "worlds of the strata" are just that. Entire worlds with skies, rivers, cities and people existing below the surface of the earth itself. What's more disturbing is that historical figures from our past actually live here as well (it is noted at the end of season one that time in the strata passes differently then on the surface).
* HonorBeforeReason: Arkana got it ''bad'' sometimes.
* {{Ineffectual Sympathetic Villain}}s: The Pirates border on this trope.
* KeepCirculatingTheTapes: The French version has been released on DVD in Region 2. The English dub still hasn't been released ''anywhere''.
* LeitMotif
* LostTechnology: None of the Arkadians know how all their whiz-bang stuff works anymore, beyond "push this button to make the machine do something useful."
* LukeIAmYourFather: Spartakus is an orphan and a major character. This was bound to happen.
* NonSingingVoice: The Pirates' song and the Flashbick were supposedly sung by, respectively, the Pirates and Bic and Bac, but in the original French the singing voices were provided by the child group Mini-Star and didn't sound anything like the decidedly adult speaking voices. Especially blatant in the case of the Pirates.
* NonstandardCharacterDesign: The Pirates, who are much more toony-looking than the rest of the cast.
* OrphansPlotTrinket: Spartakus' trick gauntlet.
* ThePiratesWhoDontDoAnything: Semi-averted with The Pirates of the Seas. They ''will'' jump on you and loot your stuff... just as soon as they finish singing in their music video. The pirates also have a rival group of ruffians (who do not have their own song), lead by Ringnar, who also occasionally try to do something but fail.
** Also much is made about Spartakus being the finest gladiator ever to roam the strata, but his combat skills are almost never used to solve a problem.
* PlayingWithFire: Bic and Bac have the ability to,among other things, create fire by rubbing their noses together.
* ReallySevenHundredYearsOld: Bic and Bac, happy little critters resembling pangolins, who might be the oldest living things in Arkadia.
* ShoutOut
* WomanInWhite: Arkana.
* XtremeKoolLetterz: They're Greek. They can have all the K's they want in their names, dammit.
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