10 Infinity War & Endgame Mysteries That The MCU Still Hasn’t Solved 5 Years Later

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Summary

The Russo brothers' Avengers: Infinity War and Endgame changed the MCU forever, but left many mysteries unanswered.
Major mysteries include the Ancient One's Infinity Stones warning, Kraglin's role in Infinity War, the Collector and the Red Skull's fates, and what became of Endgame's alternate timelines.
Some mysteries can still be explored, such as the details of Thanos' attack on Xandar, and what happened on Steve Rogers' mission to return the Infinity Stones.

Five years after Avengers: Infinity War and Avengers: Endgame concluded the Infinity Saga, Marvel Studios is still no closer to solving some of the most frustrating mysteries in the MCU. Released in 2018 and 2019, respectively, Infinity War and Endgame marked the culmination of a decade of storytelling in the MCU, bringing together every superhero introduced since 2008's Iron Man to battle the Mad Titan Thanos. Following their premieres, Infinity War and Endgame became two of the highest-grossing movies of all time, and by far the most successful projects in the MCU, but they still left many burning questions unanswered.
Directed by the Russo brothers, Avengers: Infinity War and Endgame changed the landscape of the MCU forever. The two-part finale of the Infinity Saga laid the foundations for the MCU's Multiverse Saga, marked the Avengers' first major loss, and saw beloved superheroes die and retire, making space for several new legacy heroes. Despite being recognized as two of the MCU's most successful, profitable and popular installments, however, there are still many unanswered mysteries from Infinity War and Endgame that Marvel Studios hasn't taken steps to answer. Five years on, some of these major MCU mysteries still need to be resolved.
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Related Why Avengers: Endgame Couldn't Beat Infinity War Despite satisfyingly ending the MCU’s Infinity Saga, it was always going to be difficult for Avengers: Endgame to surpass Avengers: Infinity War. 10 The Ancient One Warned The Hulk About The Infinity Stones Bruce Banner Spoke To The Ancient One In 2012 In Avengers: Endgame

During the Avengers' Time Heist in Endgame, Bruce Banner's Smart Hulk traveled to New York City in 2012 to acquire the Time Stone from the Ancient One. The Sorcerer Supreme was hesitant to give up the Time Stone, however, providing Banner with a warning that removing an Infinity Stone, the "chief weapon against the forces of darkness," from the timeline would allow the world to be "overrun." It's unclear exactly what the Ancient One was referring to, and Banner seems to have forgotten this warning. The MCU's current timeline has no Infinity Stones, yet the world hasn't yet been overrun.
9 What Was Kraglin Doing During Infinity War? Kraglin Was Doing Something Important In Avengers: Infinity War

Following Infinity War's release in 2018, Guardians of the Galaxy director James Gunn was questioned about Kraglin's whereabouts. Kraglin joined the Guardians of the Galaxy at the end of 2017's Vol. 2, but was absent for Infinity War, with Gunn claiming that he was "doing something important" (via Reddit). Kraglin's actions during Infinity War and Endgame have yet to be revealed, and weren't mentioned at all during 2023's Guardians of the Galaxy Vol. 3. With the future of the Guardians of the Galaxy uncertain after James Gunn's exit from Marvel Studios, it's unclear if this mystery will ever be solved.
Kraglin is an official member of the new Guardians of the Galaxy team, along with Rocket Raccoon, Groot, Adam Warlock, Blurp, Cosmo and Phyla.
8 How Did Old Steve Rogers Return In Endgame, & Where Is He Now? Steve Rogers Returned In Avengers: Endgame To Make Sam Wilson Captain America Close At the end of Avengers: Endgame, Steve Rogers embarked on his solo mission to return the Infinity Stones and Mjolnir to their respective timelines. Instead of immediately returning, however, Rogers took the opportunity to retire in the past with Peggy Carter, finally getting his happy ending. However, he did reappear as an old man to pass the Captain America mantle onto Sam Wilson, but the details of exactly how he returned haven't been explained. It's also unclear whether Steve Rogers is still alive in the MCU's current continuity, so it's possible the older Steve Rogers may return to the MCU.

Avengers: Endgame PG-13FantasyAdventureAction The penultimate chapter in the Marvel Cinematic Universe, Avengers: Endgame, marks the finale of the first three phases of the MCU and acts as part two of Avengers: Infinity War. With Earth's Mightiest Heroes failing to stop Thanos from wiping out half of all existence, the heroes discover one final chance to make things right. Journeying back through space and time, the surviving Avengers attempt to stop Thanos before all is lost.
Release Date April 26, 2019 Director Joe Russo , Anthony Russo Runtime 3 hours, 2 minutes 7 Who Is Braddock? Peggy Carter Teased Braddock In 1970 In Avengers: Endgame

After losing the Tesseract, Tony Stark and Steve Rogers travel further back to take the Space Stone from another time period. They journey to Camp Lehigh in 1970, where SHIELD has been established, and while Stark tracks down the Tesseract, Rogers tries to find more Pym Particles, allowing them to return home. He catches a glimpse of Peggy Carter, however, who can be heard questioning what happened to a man named Braddock. In Marvel Comics, Brian Braddock becomes the superhero Captain Britain, but despite having a major role in multiverse storylines, Braddock still hasn't made an appearance in the MCU.
6 What Happened When Thanos Decimated Xandar? Thanos' Attack On Xandar Happened Prior To Avengers: Infinity War

When Thor meets the Guardians of the Galaxy in Infinity War, he reveals that Thanos "decimated Xandar last week" in order to claim the Power Stone, which had been safely stored with the Nova Corps since 2014's Guardians of the Galaxy. The Power Stone is the only one of the Infinity Stones that audiences haven't seen Thanos claim on-screen, but there have been calls for his attack on Xandar to be shown in the MCU. While the details of this have remained hidden, there is speculation that Marvel Studios' Nova series could finally explore Thanos' quest for the Power Stone.

Avengers: Infinity War PG-13ActionSci-FiSuperhero Avengers: Infinity War is the third Avengers movie in the game-changing Marvel Cinematic Universe. This film is positioned as the beginning of the culmination of everything that has transpired in the franchise to date. Directors Joe and Anthony Russo, who previously helmed Captain America: The Winter Soldier and Civil War, have assembled the largest ensemble in a superhero film to date. Nearly every living character in the MCU is included as the Avengers join forces with the Guardians of the Galaxy to take down Thanos in a battle that has massive repercussions for the future of the entire Marvel Cinematic Universe. A sequel, Avengers: Endgame, was released in 2019 and marked the end of the Infinity Saga.
Release Date April 27, 2018 Director Joe Russo , Anthony Russo Runtime 149 minutes 5 What Happened To The Red Skull Once The Soul Stone Was Claimed? The Red Skull Guarded The Soul Stone On Vormir Close 2011's Captain America: The First Avenger ended with the Red Skull being thrust into space after holding the Tesseract, and Infinity War revealed that he had been sent to Vormir to guard the Soul Stone. This was a seemingly inescapable curse, but Marvel Studios hasn't revealed what happened to the Red Skull after the Soul Stone was claimed - first by Thanos in Infinity War, and then by Clint Barton in Endgame. It's possible the Soul Stone being taken freed the Red Skull, allowing him to return in the MCU's future, but there has been no sign of him since.
4 Is The Collector Actually Dead? The Collector's Fate Is Unclear After Avengers: Infinity War

The Collector made his debut in Thor: The Dark World's post-credits scene, introduced as a collector of all manner of flora and fauna who was given the Reality Stone to store. This made him a target for Thanos in Infinity War, who traveled to Knowhere to claim the Reality Stone. While Thanos obtained the Reality Stone, the fate of the Collector hasn't been revealed, though it was speculated that the Guardians of the Galaxy bought Knowhere from him prior to 2022's The Guardians of the Galaxy Holiday Special. Of course, it's also possible he didn't survive the Mad Titan's attack.
Benicio Del Toro returned to voice the Collector in Marvel Studios' What If...? season 1, but he hasn't appeared in live-action since Avengers: Infinity War.
3 Where Is Harley Keener Now? Ty Simpkins' Harley Keener Returned In Avengers: Endgame After Iron Man 3

Harley Keener made his first appearance in 2013's Iron Man 3 as the child that Tony Stark befriends after finding himself stuck in Tennessee. Keener helps Stark get back into action, and evidently had an impact on the Avenger's life as he reappeared in Endgame at Stark's emotional funeral. This was a surprising cameo, as Keener has become a young man since Iron Man 3. Theories arose that his return in Endgame hinted at a bigger role for him in the MCU's future, but he hasn't yet been featured in any further projects, so his true future is still unclear.

Related The MCU Can't Pay Off A Big Iron Man 3 Tease Anymore Iron Man 3 teased a big future for a new character, but with the latest additions to the Multiverse Saga, the MCU can't pay it off anymore. 2 Did Endgame’s Alternate Timelines Get Pruned By The TVA? Avengers: Endgame's Time Heist Created Several Alternate Timelines Close Branching timelines and alternate realities weren't common vernacular prior to 2021's Loki series, which saw the Time Variance Authority pruning these branched timelines to erase any Kang the Conqueror variants. The existence of the TVA raised questions about whether they pruned the timelines created during the Time Heist in Endgame or not. In Loki, Ravonna Renslayer revealed the Avengers were supposed to time travel, implying the TVA didn't prune these realities. However, with some big changes made, such as Thanos' absence, Steve Rogers knowing Bucky is alive and the Tesseract being stolen, the TVA surely can't have ignored them completely.
1 What Happened When Captain America Returned The Infinity Stones? Steve Rogers Returned The Infinity Stones At The End Of Avengers: Endgame

One of the biggest mysteries from Avengers: Infinity War and Avengers: Endgame is what happened on Steve Rogers' mission to return the Infinity Stones. After defeating Thanos, Rogers journeyed through time to return the Infinity Stones and Mjolnir to their timelines. However, the Space Stone was no longer in the Tesseract, the Power Stone wasn't in the Orb, the Reality Stone wasn't liquid, the Mind Stone wasn't in Loki's scepter, and returning the Soul Stone to the Red Skull would have been an interesting interaction. While many want to see this journey in the MCU, it remains a complete mystery.

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