Marvel fans are buzzing about The Fantastic Four: First Steps, but it’s not just the superhero action that’s capturing attention. Vanessa Kirby, who brilliantly portrays Sue Storm, has revealed heartwarming behind-the-scenes details about working with Robert Downey Jr., including a special nickname the cast gave the Oscar-winning actor.
RDJ: From Iron Man to “The Godfather”
In a candid interview with Variety, Kirby shared how Robert Downey Jr. became the unofficial mentor and protector of the Fantastic Four cast. “Robert’s never not been on set. He’s always there,” the actress revealed, highlighting his dedication despite having limited screen time in the film.
The most touching revelation? “We call him our Godfather. He’s looked after us,” Kirby disclosed, showing the deep respect and affection the cast holds for the veteran actor.

The Fantastic Four: First Steps Cast and Crew
| Character | Actor | Previous Notable Work |
|---|---|---|
| Sue Storm | Vanessa Kirby | Mission: Impossible franchise |
| Reed Richards | Pedro Pascal | The Last of Us, The Mandalorian |
| Dr. Doom | Robert Downey Jr. | Iron Man, Avengers franchise |
| Director | Matt Shakman | WandaVision, It’s Always Sunny |
Behind the Scenes: RDJ’s Mentorship Role
Despite Dr. Doom appearing only in post-credit scenes, Downey Jr.’s presence was felt throughout the entire production. His commitment to being on set daily showcases the professionalism and leadership qualities that made him the cornerstone of the original MCU.

Why This Matters for Marvel’s Future
This behind-the-scenes dynamic reveals several important aspects:
Continuity and Legacy: RDJ’s involvement bridges the gap between classic MCU and the new phase, providing institutional knowledge and experience.
Character Development: His mentorship likely influenced how the Fantastic Four will integrate into the broader MCU narrative.
Team Chemistry: The “Godfather” title suggests genuine camaraderie that will translate into authentic on-screen relationships.
Vanessa Kirby’s Sue Storm: A Comic-Faithful Approach
Kirby expressed enthusiasm about director Matt Shakman’s vision for Sue Storm, emphasizing authenticity to the source material. “It was such a pleasure to go back and read Sue from 1961,” she shared, highlighting the research and dedication put into the character.
Sue Storm’s Leadership Evolution
The actress particularly appreciated the character’s leadership qualities, which played a major role in her decision-making process. This suggests we’ll see a more assertive, central Sue Storm than in previous adaptations.
The Road to Avengers: Doomsday
While Kirby and Downey Jr. shared minimal screen time in First Steps, fans can expect significant interaction in Avengers: Doomsday, scheduled for December 2026. The film will unite:
- Original Avengers cast members
- New Avengers heroes
- The complete Fantastic Four team
- Multiple MCU characters against Dr. Doom
For more Marvel coverage and superhero movie analysis, check out our MCU phase updates and explore our superhero movie rankings.
Critical Reception and Box Office Performance
The Fantastic Four: First Steps is currently performing well in theaters, suggesting audiences are embracing this fresh take on Marvel’s first family. The positive reception bodes well for the characters’ integration into future MCU projects.
What This Means for MCU’s Future
RDJ’s transition from hero to villain, combined with his mentorship role behind the scenes, creates a unique dynamic that could redefine Marvel storytelling. His dual role as both antagonist and industry veteran adds layers of complexity to upcoming narratives.
The “Godfather” nickname isn’t just endearing—it represents a passing of the torch from MCU’s founding era to its next generation of heroes.
Industry Impact and Fan Expectations
This revelation humanizes the often corporate-feeling superhero movie machine, showing genuine relationships forming between cast members. It also sets high expectations for the chemistry we’ll see in future ensemble pieces.
The success of these relationships both on and off-screen will likely influence how Marvel approaches future team-building projects and character integrations.
Stay tuned as the Fantastic Four journey continues toward their inevitable showdown with their on-set “Godfather” turned ultimate villain!
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