With Avengers: Doomsday’s Cast Revealed, Here Are 8 MCU Character Mysteries Marvel Must Address

With the recent revelation of the first 27 cast members for Avengers: Doomsday, anticipation for the Marvel Cinematic Universe’s Phase 6 has reached new heights. Directed by the Russo brothers, this upcoming crossover film not only promises to bring back an array of beloved characters but also holds the potential to resolve numerous lingering MCU mysteries. The return of iconic figures from the Avengers, the Thunderbolts, the Fantastic Four, and even the X-Men suggests that many unfinished story arcs may finally find closure.

The cast list features recognizable names such as Anthony Mackie, Winston Duke, Simu Liu, and Channing Tatum, setting the stage for definitive answers to questions surrounding their past roles in the MCU. Notably, fans are eager to learn how the classic X-Men will transition from the 20th Century Fox franchise and how Robert Downey Jr. will embody Doctor Doom after his memorable portrayal of Iron Man. As Doomsday prepares to unveil its narrative, here are eight pivotal mysteries that could be explored.

8
Who Will Be in the MCU’s Official New Avengers Team?

Captain America: Brave New World Teased the MCU’s New Avengers

After a seven-year hiatus from the screen, Doomsday promises to debut a reimagined Avengers team. The groundwork for this revival was laid in 2025’s Captain America: Brave New World, where Sam Wilson was called to rally a new group of heroes. Although this did not manifest in that Phase 5 film, Doomsday will fulfill that promise.

Initial reports suggest that the new Avengers roster could feature Anthony Mackie’s Captain America, Danny Ramirez’s Falcon, Chris Hemsworth’s Thor, Letitia Wright’s Shuri, Tenoch Huerta Mejía’s Namor, Simu Liu’s Shang-Chi, Winston Duke’s M’Baku, and Paul Rudd’s Ant-Man. There remains speculation over the inclusion of other characters like Captain Marvel, the Hulk, She-Hulk, and Spider-Man, leaving fans eager for updates on the complete lineup in Doomsday.

7
How Will Monica Rambeau Get Back to Earth-616?

Monica Rambeau Was Trapped in an Alternate Universe in The Marvels

The finale of The Marvels revealed Teyonah Parris’ Monica Rambeau using her powers to seal a crucial rift in reality, yet she became trapped in an alternate universe. While her return to Doomsday hasn’t been confirmed, intriguing clues suggest the resolution of this cliffhanger is imminent, especially with Kelsey Grammer reprising his role as Beast.

There’s speculation regarding whether this alternate reality aligns with Fox’s X-Men franchise, hinting at the potential introduction of a reimagined X-Men team that includes Lashana Lynch’s Maria Rambeau as Binary. Such developments might breathe new life into previously unexplored narrative threads.

6
Is M’Baku the New King of Wakanda?

M’Baku Challenged for the Throne in Black Panther: Wakanda Forever

Winston Duke’s involvement in Doomsday reinforces the importance of Wakanda in the plot, especially with confirmed appearances from Letitia Wright and Tenoch Huerta Mejía. M’Baku, once a secondary antagonist, has evolved into a pivotal ally to Shuri, creating a foundation for a potential ascension to king.

If M’Baku becomes Wakanda’s ruler, he would be the fifth to hold such a title, shaping the kingdom’s future dramatically. The transition of power could open intriguing narratives, especially in the context of proceeding events in Doomsday.

5
What Happened to Gambit After Leaving the Void in Deadpool & Wolverine?

Gambit Left the Void in Deadpool & Wolverine‘s Deleted Scene

Channing Tatum’s Gambit made his long-awaited debut in Deadpool & Wolverine, leading to speculation about his involvement in Doomsday. In a pivotal deleted scene, Gambit was depicted as a character poised to escape a realm known as the Void, using a portal created by the Master of the Mystic Arts.

As Doomsday unfolds, clarity on Gambit’s escape from the Void could be an exciting addition, shedding light on this character’s future and setting up potential dynamics among Marvel’s mutant characters.

4
Who Is Shang-Chi’s Ten Rings Beacon Signaling Across the Cosmos?

Wong Revealed the Ten Rings Sending a Beacon in Shang-Chi & The Legend of the Ten Rings

Shang-Chi and the Legend of the Ten Rings not only introduced Simu Liu’s character but also raised new questions surrounding the enigmatic Ten Rings. During the film’s conclusion, a pivotal post-credits scene featured a beacon being emitted from the rings, hinting at deeper cosmic connections.

Theories surrounding this beacon suggest potential links to Doctor Doom or other unrevealed universes, prompting excitement about its implications for Doomsday. Fans are eager to see how these threads are woven into the overarching multiverse narrative.

3
What Happened When Professor X Killed the X-Men Before Logan?

Avengers: Doomsday May Take Place Before the Events of Logan

Set in the future of 2029, Hugh Jackman and Patrick Stewart’s Logan explored a devastating storyline involving the deaths of the X-Men due to Charles Xavier’s condition. The potential for Doomsday to address these events is a tantalizing prospect, especially with returning characters from the Fox universe.

Exploring this dark chapter could provide a pivotal connective thread, perhaps leading to a new beginning for the X-Men in the MCU.

2
How Did Earth-838’s Other Heroes React to the Scarlet Witch’s Attack?

Avengers: Doomsday Is the Perfect Place for Earth-838 to Be Revisited

In the groundbreaking 2022 film, Doctor Strange in the Multiverse of Madness, Earth-838 was introduced, showcasing a universe where the Scarlet Witch wreaked havoc. The loss of key figures such as Mister Fantastic and Professor X will inevitably ripple through the multiverse narrative and could culminate in Doomsday.

The possibility of exploring the aftermath of the Scarlet Witch’s attack opens doors for new and returning characters from Earth-838, potentially evolving into an alternate Illuminati or showcasing variant heroes. The stakes are high for a deeper narrative connection in the upcoming film.

1
Why Does Doctor Doom Look Like Tony Stark?

Robert Downey Jr. Will Play Doctor Doom in Phase 6, Not Iron Man

The announcement that Robert Downey Jr. will portray the formidable Doctor Doom has sparked widespread excitement but also confusion, given his legacy as Iron Man. Fans are curious about how Marvel will reconcile Stark’s heroic past with the introduction of Doom.

It remains unclear how these two characters will be linked within the narrative, yet speculation abounds that they may represent variants of one another or that Doom might have adopted elements of Stark’s identity. Such revelations could heighten the tension for the heroes connected to Iron Man, necessitating a thorough exploration within Doomsday.

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