Eternals
Summary
A majorMCUtheory may serve to explain the connection between the Mad Titan Thanos and his pal , Eros , who debut in Phase 4’sEternals , and could provide more setting to Thanos’Avengers : Infinity Warconquest . Even though Chloé Zhao ’s MCU directorial debutEternalsis viewed as one of the MCU ’s most divisive undertaking , the Phase 4 project teased a more in - depth geographic expedition of Thanos ' backstory by stick in Harry Styles as Eros , Thanos ' brother . However , the connection between Eros and the iconic MCU supervillain has caused some mental confusion , peculiarly since Marvel Studios altered the Eternals ' origin tale from Marvel Comics .
The sore Titan Thanos first appeared in thepost - course credit scene ofThe Avengers , but was portrayed by Josh Brolin fromGuardians of the Galaxyonwards . He was n’t by rights insert until 2018’sAvengers : Infinity War , however , as the Phase 3 projection explored Thanos ' pursuance to acquire the six Infinity Stones and bring symmetricalness to the cosmos . Despite revealing more about Thanos ' backstory , Infinity Warfailed to mention anything about his category on Titan , which madeEros ' first appearance inEternalsall the more complicated . Even so , a newfangled theory may have uncovered the exact connective between Thanos and Eros in the MCU .
Although Chloé Zhao ’s Eternals localize up four major plot line for the MCU ’s future , only one of them might be acknowledge during Phase 5 .

Marvel Studios Changed The Eternals’ Backstory, So How Can Eros & Thanos Be Brothers?
One of the biggest points of mental confusion surround Thanos and Eros stems from the fact thatMarvel studio apartment changed the Eternals ' backstoryfor their live - action debut . In Marvel Comics , the Eternals are an offshoot of humanity , the result of Celestial experiment on proto - world which also saw the birth of Deviants and mutants . Despite come along homo , the Eternals have elongated life and superhuman ability , though they are very much biologic beings . In the MCU , however , the Eternals are synthetical beings created by the Celestial Arishem in the World Forge , so it ’s unclear how Eros , an hokey Eternal , can have a comrade .
Eros , a.k.a . Starfox , was a controversial character in Marvel Comics , most notably as he was accused of using his ability to control others ' emotion to seduce a married woman , go to a intimate assault test which he tried to duck .
Thanos and Eros ' connection is much unclouded in Marvel Comics , as Thanos was born as an Eternal , though stockpile the Deviant gene , contribute to his take issue coming into court to his peer . This meant that Thanos and Eros were biological brothers in Marvel Comics , but the distinction wo n’t be so easy to excuse with the MCU ’s Eternals ' newfangled origin story . Even though neither Thanos nor Eros have been confirm to be returning to the MCU , late speculation suggests thatThanos may be re-emerge presently , so his family could be analyze more closely , and one new possibility might have already uncover the trueness .

Eros Was Adopted Into Thanos’ Family: Eternals Theory Explained
A fresh MCU theory shared onRedditsuggests that Eros may have actually been adopted into Titan ’s community , perhaps becoming Thanos ' brother by legal means rather than biological . The theory poses that Eros was one of ten Eternals sent to Titan to ensure the population ’s growth and the issue of a Celestial seed inside the major planet , similarly to howAjak ’s Eternal team was institutionalize to Earth . Eros and his fellow Eternals would have remained on Titan for millenary , and probably would have integrated into Titan ’s bon ton , so it reach sensation that Eros could have been adopted by Thanos ' own parents .
Since nothing is known aboutThanos ' family in the MCU , succeeding Marvel Studios project may rise or disprove this hypothesis , specially if the Mad Titan return at some head to wreak havoc again . There has also been no mention of Titan ’s history outside ofAvengers : Infinity War’sbrief clock time on Thanos ' homeworld , so it ’s indecipherable whether a Celestial really was growing inside the planet . However , this theory could provide the perfect explanation for Harry Styles ' Eros being describe as Thanos ' crony , and could suffice some major questions fromInfinity Warabout Thanos ' own motivations and the fate of his macrocosm .
Titan has only been visited in two MCU labor : 2018’sAvengers : Infinity Warand in a flashback in 2022’sDoctor Strange in the Multiverse of Madness .

Titan’s Population Growth Answers Major Thanos Questions
The idea of Eros being integrated like a shot into Thanos ' family on Titan , while also trying to expand the population of the world , may help to resolve some huge question about Thanos ' own actions throughout the history of the MCU.Thanos spent years prior to his MCU debut becoming a universe - renowned warlord , as he traveled across the cosmos to invade worlds and half each major planet ’s population . finally , this led to his design inInfinity War , which saw him collect theInfinity Stonesand wipe out half the universe of the creation , but his reasoning for this strategy was n’t ever properly explain .
Eros ' entire purpose on Titan would have been to grow the population , allowing the Celestial within to one day emerge , but this would have worried Thanos . Thanos may have even learned of Eros ' true design on Titan , yet was reckon as a madman when he suggested a random culling to stem the population growth and foreclose the Celestial from emerging . Perhaps in an endeavour to stop any other world from brook Titan ’s fate , Thanos forge hisInfinity Warplan , though while he may have been well - intentioned , his method for thwarting the growth of further Celestials were uttermost and seriously blemished .
Titan’s Infinity War Mystery Can Be Explained By Eternals
While nothing has yet been realize by Marvel Studios , the idea of a Celestial growing inside Titan , and the universe growing so out of restraint that the Celestial was able to come out , also explain one hugemystery fromAvengers : Infinity Warthat has n’t been addressed . After Iron Man , Spider - Man , Doctor Strange and the Guardians of the Galaxy recover themselves on Titan inInfinity War , Peter Quill ’s Star - Lord take that the entire planet is eight level off its bloc , which does n’t make sensation as a symptom of overpopulation . Something more catastrophic must have happened to Titan to have this planetary shift .
One of the few organism in the MCU that can impact the geology of an entire Earth is a Celestial , and a successful Celestial egress from within Titan would explain why the planet is eight degrees off its axis vertebra , and why the mankind transformed from a lavish and bustling society into a desolate and destroyed waste . Some would reason that a Celestial growth would have torn the intact major planet aside , butTiamut ’s emergence from inside Earth did n’t have global repercussions . It ’s unclear whetherEternalswill get a sequel in the MCU ’s futurity , so these question may , unfortunately , never be serve .



