Will Mephisto Be In Avengers: Doomsday? Speculating on His MCU Future After Ironheart

With Mephisto’s chilling debut in Ironheart Episode 6, Marvel fans are buzzing with one big question: Will Mephisto Be In Avengers: Doomsday?

Unveiled on Disney+ on July 1, 2025, as the demonic dealmaker who tempts Riri Williams (Dominique Thorne) with a Faustian bargain, Sacha Baron Cohen’s Mephisto has ignited speculation about his role in the MCU’s future.

This article explores his Ironheart appearance, analyzes clues from the comics and MCU, and speculates on whether he’ll face off against Doctor Doom and Earth’s Mightiest Heroes in Avengers: Doomsday (December 18, 2026) and Avengers: Secret Wars (December 17, 2027).

What Was Mephisto’s Role in Ironheart Episode 6?

In Ironheart’s finale, “The Past Is the Past,” Mephisto emerges as the puppet master behind The Hood’s (Anthony Ramos) demonic cloak.

After Riri defeats Parker Robbins, Mephisto confronts her in a wrecked pizza parlor, offering to resurrect her friend Natalie in exchange for an unspecified price.

The episode ends with Riri bearing black-veined scars, suggesting she accepted the deal, mirroring Parker’s corruption.

Sacha Baron Cohen’s Mephisto is suave, alternating between British and American accents, and casually references past clients like “three Popes and Ringo from The Beatles” (ScreenRant).

His debut, confirmed by showrunner Chinaka Hodge, fulfills years of fan speculation since WandaVision (2021), amplified by his name-drop in Agatha All Along (ScreenRant). This sets the stage for bigger MCU appearances.

Why Does Mephisto’s Comic History Suggest a Role in Avengers: Doomsday?

Mephisto, created by Stan Lee and John Buscema in Silver Surfer #3 (1968), is Marvel’s devilish manipulator, ruling a pocket dimension called “Hell.” In comics, he torments heroes like Spider-Man, Doctor Strange, and Scarlet Witch, but his rivalry with Doctor Doom is key.

Mephisto holds Doom’s mother, Cynthia Von Doom, in his realm, driving Doom to obsessively seek her freedom (Doctor Strange and Doctor Doom: Triumph and Torment, 1989).

With Robert Downey Jr. cast as Doctor Doom in Avengers: Doomsday, this comic dynamic fuels speculation. MovieWeb notes that Doom’s backstory with his mother could motivate his actions, paving the way for Mephisto to appear as a supernatural antagonist. X posts, like @SheldonWroteIt’s “Mephisto definitely gonna be in Doomsday,” reflect fan confidence in this connection.

How Could Mephisto Fit Into Avengers: Doomsday’s Plot?

Avengers: Doomsday, directed by the Russo Brothers, pits the Avengers, Fantastic Four, X-Men, and others against Doctor Doom in a multiversal conflict (Marvel). Theories suggest the film may adapt elements of Secret Wars (1984), where Doom rules Battleworld, a patchwork world of colliding realities (Newsweek). Mephisto’s ability to manipulate reality and souls makes him a natural fit.

Kotaku speculates that Riri Williams, now tied to Mephisto via her deal, will appear in Doomsday, with her black-veined scars hinting at his lingering influence. A Reddit theory from r/MCUTheories posits Mephisto could manipulate Doom, perhaps striking a deal to amplify Doom’s power in exchange for chaos, mirroring his Ironheart tactics.

His presence could also tie to Ghost Rider rumors, as Ryan Gosling’s interest in the role aligns with Mephisto’s comic ties to the Spirit of Vengeance (MovieWeb).

Could Mephisto Play a Bigger Role in Avengers: Secret Wars?

Avengers: Secret Wars, the Multiverse Saga’s climax, draws from the 2015 Secret Wars comic, where Doom reshapes reality as God Emperor (The Flagship Eclipse).

Mephisto’s comic role as a multiversal schemer, leading the Council of Red, a group of Mephisto variants, makes him a candidate for a larger role (Marvel Database). His Ironheart debut as a dealmaker who thrives on desperation could see him exploiting the multiverse’s collapse.

ScreenRant suggests Mephisto might target the Young Avengers, given his comic history of corrupting young heroes like Riri in the Champions arc. With characters like Ms. Marvel and Kate Bishop potentially in Doomsday (Newsweek), Secret Wars could expand this thread. X user @mclr4n’s post about Doomsday being “the messiest movie” hints at Mephisto’s chaotic potential escalating into Secret Wars.

What Other MCU Projects Might Feature Mephisto First?

While Doomsday is a strong contender, Mephisto could appear elsewhere first. MovieWeb and jkgeekly.com propose he might show up in Doctor Strange 3, given his comic rivalry with the Sorcerer Supreme, or a Midnight Sons film, facing supernatural heroes like Blade and Moon Knight.

A rumored Disney+ special starring Cohen, mentioned on Reddit’s r/MCUTheories, could bridge his Ironheart debut to Doomsday. His Agatha All Along name-drop as a possible mastermind behind Nicholas Scratch (ScreenRant) suggests a role in magical storylines.

However, Doomsday’s focus on Doom and multiversal stakes aligns more closely with Mephisto’s comic schemes, like his attacks on the Avengers (Marvel.com).

Why Are Fans Divided on Mephisto’s Potential Role?

Fan excitement, evident in X posts like @Bullman53170100’s “I expect that to lead to Mephisto appearing in Doomsday,” is tempered by skepticism. Some, like @DavidRo59091928, hope for a deeper supernatural arc in Doomsday or Secret Wars, but others, per Reddit’s r/MCUTheories, worry Marvel might underuse Mephisto after years of teases.

Ironheart’s mixed reception (86% Rotten Tomatoes, 3.6/10 IMDb) and abrupt supernatural shift fuel doubts about his integration. Still, the Russo Brothers’ knack for balancing large casts (Avengers: Endgame) suggests they could weave Mephisto into Doomsday as a secondary threat, setting up a bigger Secret Wars role.

His shape-shifting nature, noted by Hodge, allows flexibility—perhaps even a new actor like Meryl Streep, as Variety speculated.

Highlights of Mephisto’s Potential in Avengers: Doomsday  

• Ironheart Debut: Mephisto, played by Sacha Baron Cohen, tempts Riri in Episode 6, released July 1, 2025.

• Comic Ties: Rivals Doctor Doom, holding his mother’s soul, relevant to Doomsday’s villain.

• Doomsday Release: December 18, 2026, with Robert Downey Jr. as Doctor Doom.

• Secret Wars Role: Could manipulate multiversal chaos in the December 17, 2027, sequel.

• Other Projects: Possible appearances in Doctor Strange 3 or a Mephisto Disney+ special.

• Fan Buzz: X posts and Reddit theories strongly back his Doomsday involvement.

Some Closing Thoughts:

The question Will Mephisto Be In Avengers: Doomsday? remains unanswered, but his Ironheart debut and comic ties to Doctor Doom make it a tantalizing possibility.

Whether as a schemer in Doomsday or a multiversal threat in Secret Wars, Mephisto’s demonic presence could redefine the MCU’s supernatural stakes.

Stream Ironheart on Disney+ to catch his chilling introduction, and join the X debate about his next move.

Will he haunt the Avengers? The multiverse awaits.