History ShoutOut / MarathonExpandedUniverse

* A log in "The Gators of NY" is verified by one "C.{Bukowski}", who is presumably named after the American poet and novelist Charles Bukowski.

* Although this isn't confirmed, [[spoiler:[[https://cdn.discordapp.com/attachments/691755375329804318/811088711646314576/hathor-volat.gif Hathor's]] [[https://cdn.discordapp.com/attachments/691755375329804318/811086713711624192/hathor-impetit.gif cyborg]] [[https://cdn.discordapp.com/attachments/691755375329804318/811087500725977088/hathor-defendit.gif form]]]] in 1.3 may be at least partially an homage to a [[https://en.wikipedia.org/wiki/SHODAN rather famous example]] of EvilIsSexy and AIIsACrapshoot from [[VideoGame/SystemShock one of Marathon's contemporary series]] – her largely black suit and {{Medusa}}-like hair are pretty big giveaways on this count. (Note that, despite their superficial similarities, the two do have some substantial differences in terms of characterisation, though - not least that [[spoiler:Hathor has undergone a HeelFaceTurn by the point Marcus "fights" her; she's mad at Marcus, but she acknowledges that it's her own fault, and she's not even trying to kill him, since she knows he has the wave motion cannon and gravitronic blades, which both nullify damage from wave motion cannon blasts if active]].)

** He writes "''Ego delendus sum'': I am to be destroyed, am I not?" This is a reference to a famous phrase from Roman politician Cato the Censor, "''Carthago delenda est''." See ''Marathon's [[GratuitousLatin/{{Marathon}} Gratuitous Latin page]] ''atque Eternal''[='=]s [[GratuitousLatin/MarathonExpandedUniverse Gratuitous Latin entry]] for more on this.

* In 1.3, one terminal in "Deep into the Grotto" contains an excerpt from "Historia populí dé potestáte super armís", written InUniverse by a [[spoiler:Jjaro]] historian named Naomi Zinn. This is Latin for "A People's History of Arms Control", an obvious ShoutOut to ''A People's History of the United States'' by ''Howard'' Zinn. It's quite likely that Naomi's given name is also a ShoutOut to Howard's close friend, the linguist and political philosopher Noam Chomsky, since ''Naomi'' (נָעֳמִי‎, ''no'omí'', literally ''my pleasantness'') and ''Noam'' (נועם or נֹעַם, ''nó'am'', literally ''pleasantness'') have the same root. The codirector listing Chomsky as an influence (see below) may be a further hint that this is intentional; ''Eternal''[='=]s overall political stance is certainly quite compatible with both Zinn and Chomsky's.

** Games: ''VideoGame/Doom64'', ''VideoGame/{{Marathon}}'' (big surprise), ''VideoGame/{{Quake}}'', ''VideoGame/TombRaider'', and ''VideoGame/{{Turok}}''

* As of version 1.2.1, the penultimate level, "Where Giants Have Fallen", features a mournful bird song. [[spoiler:The song continues as all the enemies die off, so the only sounds left on the level by the end are howling wind and the bird's "poo-tee-weet?" - an intentional reference to the final phrase of Creator/KurtVonnegut's ''Literature/SlaughterhouseFive'' (confirmed by looking at the map in an editor; "Poo-tee-weet?" is scrawled on it, as is "so it goes", another reference to the novel). Parallels can also be drawn between ''Eternal''[='=]s depiction of the Jjaro and ''Slaughterhouse-Five''[='=]s depiction of the Tralfamadorians; both works are subtly condemning fatalism. Like the parallels to Creator/MichaelMoorcock's writings, this apparently wasn't planned in the original release; the developers just noticed it later and ran with it.]]

** Musicians: Ashenspire, Music/BlutAusNord, Music/DeathspellOmega, Music/{{Enslaved}}, Music/{{Genesis|Band}}, Music/GodspeedYouBlackEmperor, Music/{{Magma}}, Music/{{Panopticon}}, Music/PinkFloyd
** Films: ''Film/BladeRunner'', ''Film/{{Brazil}}'', ''Film/{{Casablanca}}'', ''Film/Moonlight2016'', ''Film/PansLabyrinth'', ''Film/TwoThousandOneASpaceOdyssey''

* ''Eternal''[='=]s soundtrack also employs Music/FrankZappa's concept of xenochrony (in which an element originally written for one song is reused in another, often over an entirely different chord progression) liberally, although as of late September 2023, the clearest example by far is the "disco" movement of "Flippant" that 1.3 preview 6 is slated to use in "Once More Unto the Breach" - it reuses the organ solo from "Fat Man" and the main melody of "What About Bob?" in their entirety as guitar solos. Zappa has been explicitly cited as the inspiration for this.

* The codirector has also confirmed Music/JohannSebastianBach, Music/PhilCollins, Music/BrianEno, Minako Hamano, Creator/HirokiKikuta, Music/KingCrimson, Creator/KojiKondo, Creator/YasunoriMitsuda, Music/{{Rush}}, Creator/NobuoUematsu, Windir, and Kenji Yamamoto (the ''Franchise/{{Metroid}}'' composer, not the ''Franchise/DragonBall'' composer) as musical influences either in the [[https://1drv.ms/b/s!AuD0MykSsmaRqHp4u_8cmb4OF72b?e=u0LPx5 liner notes]] for their ''Marathon'' [[https://1drv.ms/u/s!AuD0MykSsmaRph-QWQl1PmXFYmsh?e=qrMk9B arrangement album]] (much of which was also added to ''Eternal'' in 1.3 preview 5) or the comments to the [[https://youtu.be/bRiDh3PziWU YouTube video]] of same.

* "Flight of Icarus" (name used starting in 1.2) - in addition to the mythical reference found in this and the original name "Flames of Icarus", this doubles as a reference to the third track of Music/IronMaiden's ''Piece of Mind'' (1983)

* "Back to the Future" - shout-out to the [[Franchise/BackToTheFuture franchise]] starting with [[Film/BackToTheFuture the 1985 film]] directed by Creator/RobertZemeckis and starring Creator/MichaelJFox and Creator/ChristopherLloyd

* "The World Is Hollow" - reference to the ''Series/StarTrekTheOriginalSeries'' episode "[[Recap/StarTrekS3E8ForTheWorldIsHollowAndIHaveTouchedTheSky For the World Is Hollow and I Have Touched the Sky]]" (though it also appears in the terminal text for "Flight of Icarus", along with two of the other "success dream" titles)

* ''Redux'' reportedly uses some of Music/NineInchNails' actual music, though it's not yet confirmed which levels or tracks; however, Nine Inch Nails released ''Ghosts I-IV'' and ''The Slip'' under a Creative Commons Attribution Noncommercial Share-Alike license allowing distribution or reuse under certain conditions[[labelnote:Note]]Namely:\\

Share-alike: license applies recursively; that is, copies and adaptations must be licensed under the same or a similar license[[/labelnote]], so the songs are almost certainly from those albums.

* In "Deja Vu All Over Again", one of the ''Marathon'' crew (presumably [=R McCollum=]) says of Durandal's erratic behaviour, "I'd rather not be waiting out here with flashbacks to ''2001''", referring to the [[Literature/TwoThousandOneASpaceOdyssey novel]] by Creator/ArthurCClarke (1968) and the [[Film/TwoThousandOneASpaceOdyssey film]] directed by Creator/StanleyKubrick (also 1968).[[note]]According to Clarke, the novel should really be credited to "Clarke and Kubrick" and the screenplay to "Kubrick and Clarke".[[/note]] Specifically, [=McCollum=] is comparing Durandal to HAL 9000, who is probably the TropeCodifier for AIIsACrapshoot (he [[spoiler:goes rogue and murders the crew because of a LogicBomb accidentally created by his programmers]]).

** Films: ''Film/BladeRunner'', ''Film/{{Brazil}}'', ''Film/{{Casablanca}}'', ''Film/{{Moonlight}}'', ''Film/PansLabyrinth'', ''Film/TwoThousandOneASpaceOdyssey''

* The readme included with version 1.3 has a couple. Of the S'pht Defenders, it says, "Try not to anger the friendly ones. [[Franchise/TheIncredibleHulk You wouldn't like them when they're angry]]."

** "Saturn Devouring His Son": famous painting (c. 1819-1823) by Spanish artist Francisco Goya.

* A possibly strange musical example in the extended version of "Flowers in Heaven" used in "Heart of Fusion" as of December 2022 is that the drum machine pattern is lifted from Music/PhilCollins' "[[Music/FaceValue In the Air Tonight]]" (it even samples the same drum machine, the Roland CR-78). There's also a close copy of its famous drum fill. This is [[https://onedrive.live.com/?authkey=%21AHTB9FwmGYOYxJE&cid=9166B2122933F4E0&id=9166B2122933F4E0%214865&parId=9166B2122933F4E0%214623&o=OneUp confirmed]] by its creator as a deliberate reference.

* Another musical example is a quote of "[[Music/MovingPictures YYZ]]" by Music/{{Rush}}, which shows up towards the end of the arrangement of "Fat Man" in "Run, Coward!" It's quoted twice, which the creator has [[https://onedrive.live.com/?authkey=%21AHTB9FwmGYOYxJE&cid=9166B2122933F4E0&id=9166B2122933F4E0%214865&parId=9166B2122933F4E0%214623&o=OneUp confirmed]] is in turn a shout-out to Music/{{Mastodon}}'s "The Last Baron", which quotes the same "YYZ" riff twice in much the same manner.

* In 1.3, as of August 2022, Durandal and Thoth make a few final shout-outs in "The Near Side of Everywhere", many tying in with [[spoiler:Hathor]]'s final message in "We Met Once in the Garden" (see above):

* A perhaps unusual ''musical'' example in "Run, Coward!" is a quote of "[[Music/MovingPictures YYZ]]" by Music/{{Rush}}, which shows up towards the end of its arrangement of "Fat Man". It's quoted twice, which the creators have confirmed on Discord is in turn a shout-out to Music/{{Mastodon}}'s "The Last Baron", which quotes the same "YYZ" riff twice in much the same manner.

----> The law must both protect and bind ''everyone''

:: We should note that there are, of course, other translations of this passage. Another fair one might be "Death am I, and my present task destruction."