Director Matt Shakman has recently provided insights regarding potential cameo appearances in The Fantastic Four: First Steps, suggesting that the focus may be directed towards a more intriguing prospect for Marvel’s Phase 6 reboot. As confirmed in various recent updates, the upcoming film is set to unfold in an alternate universe, distinct from the established MCU timeline of Earth-616. This narrative choice clarifies the absence of Marvel’s iconic First Family from the franchise over the past 17 years, while simultaneously paving the way for various cameos in this fresh reboot.
Set against a backdrop of 1960s-inspired retro-futurism, The Fantastic Four: First Steps has stirred speculation about possible guest appearances from variants of renowned MCU characters such as Captain America, Black Panther, and Iron Man. However, Shakman’s recent remarks indicate that fans should temper their expectations regarding these cameos. Although highly anticipated appearances might not manifest, there remains hope for the inclusion of a significant MCU veteran who could lay groundwork for future crossover narratives.
Matt Shakman Confirms Absence of Iron Man in The Fantastic Four: First Steps
Entire Focus Will Be on The Fantastic Four

In an interview with Empire, Shakman elaborated on the unique universe that The Fantastic Four: First Steps inhabits, asserting that it will not feature any MCU cameos. He expressed, “We are our own universe… which is wonderful and liberating,”emphasizing the distinctive nature of the film as “there [are] really no [other] superheroes.”This statement indicates a clear focus on the titular team, suggesting that fans can expect a narrative centered solely on them.
We are our own universe… which is wonderful and liberating. There’s really no [other] superheroes. There’s no Easter eggs. There’s no running into Iron Man or whatever. [The Fantastic Four are] it, in this universe. I love the interconnected Marvel Universe, but we get to do something so new and so different. Eventually, this world will meet up with other worlds – but for now, this is our own little corner.
While it is encouraging that the film will revolve primarily around the Fantastic Four, it is somewhat disappointing for fans expecting appearances from other beloved characters. Nonetheless, Shakman’s specific mention of Iron Man raises intriguing possibilities, especially considering that Robert Downey Jr.’s return to the MCU has been heavily speculated. Could there be a surprise in store?
The Potential for Robert Downey Jr. as Doctor Doom in The Fantastic Four: First Steps
Speculation Surrounding Doctor Doom’s Appearance

The anticipation surrounding Robert Downey Jr.’s return to the MCU has led to rampant speculation regarding the character he might portray. While earlier theories proposed that Downey could appear as a variant of Iron Man within the alternate universe, Shakman’s comments rule out this possibility. However, it’s worth noting that Downey could still make an appearance, but in a different capacity—as the villainous Doctor Doom.
In Marvel Comics, Doctor Doom is known for being a formidable adversary of the Fantastic Four, particularly with respect to Reed Richards, aka Mister Fantastic. Downey’s involvement as Doctor Doom could serve to invigorate the narrative leading into the 2026 offerings of Avengers: Doomsday and Avengers: Secret Wars. Given this context, a Doctor Doom introduction in The Fantastic Four: First Steps could lay the perfect groundwork for the broader Phase 6 narratives.
A Secret Cast Member in The Fantastic Four: First Steps?
Unidentified Actor Spotted on Set

Back in November 2024, a set video surfaced showing an unrecognized actor being discreetly escorted around the set of The Fantastic Four: First Steps (via X). This individual did not seem to be any of the confirmed cast members, including notable names like Pedro Pascal and Vanessa Kirby. Speculation abounds that the hidden actor could very well be Robert Downey Jr., particularly as rumors of his return to the MCU gained traction earlier that year.
A mysterious actor was on the set of ‘THE FANTASTIC FOUR: FIRST STEPS’ in Oviedo, Spain. The crew wanted him to remain hidden 👀 (&€“¸: @miibad7) pic.twitter.com/bcoyot0rxx — Cosmic Marvel (@cosmic_marvel) November 28, 2024
While Robert Downey Jr.’s role as Doctor Doom has only been confirmed for the upcoming Avengers films, debuting him early in The Fantastic Four: First Steps could be a masterstroke, especially in a post-credits scene. As Ineson’s Galactus is slated to be the film’s primary antagonist, introducing Doctor Doom in this manner would effectively integrate him into the MCU’s ongoing Multiverse Saga, while also establishing connections that will be pivotal as the Fantastic Four transition into 2026’s larger universe.
- Speculations about cameo appearances are widespread, but Shakman’s focus remains on the titular team.
- Robert Downey Jr. might take on a new and exciting role as Doctor Doom.
- The introduction of Doctor Doom could serve to link plots across upcoming Avengers films.