Vanessa Kirby confirms huge Fantastic Four secret everyone is talking about

epa12238984 Actress/cast member Vanessa Kirby arrives for the Sydney premiere of 'The Fantastic Four: First Steps' at HOYTS Entertainment Quarter, in Sydney, Australia, 15 July 2025. EPA/DAN HIMBRECHTS AUSTRALIA AND NEW ZEALAND OUT
Vanessa Kirby stars as Sue Storm in The Fantastic Four: First Steps (Picture: EPA)

Warning: Spoilers ahead for The Fantastic Four: First Steps.

Vanessa Kirby has confirmed the truth behind that Fantastic Four mid-credits sequence.

The British actress, 37, plays Sue Storm—or the Invisible Woman, to those in the know—in The Fantastic Four: First Steps.

Sue makes up one quarter of Marvel’s First Family, appearing alongside husband Reed Richards (Pedro Pascal), hotheaded brother Johnny Storm (Joseph Quinn) and human rock face The Thing (Ebon Moss-Bachrach) as the titular Fantastic Four.

With the Fantastic Four’s Marvel Cinematic Universe debut out now, audiences have been flocking in droves to witness their arrival.

The team may have their hands full battling cosmic world-eater Galactus and his herald, the Silver Surfer (Julia Garner), but there’ll be an even bigger villain on fans’ minds once the end credits finish rolling.

With the cat out of the bag, Kirby has clarified what Doctor Doom’s cameo at the end of the film means… and confirmed that star Robert Downey Jr. is already very much back.

SYDNEY, AUSTRALIA - JULY 15: Joseph Quinn, Pedro Pascal, Vanessa Kirby and Ebon Moss-Bachrach attend "The Fantastic Four: First Steps" Sydney Launch Event at Hoyts Entertainment Quarter on July 15, 2025 in Sydney, Australia. (Photo by Brendon Thorne/Getty Images)
Kirby stars alongside Joseph Quinn, Pedro Pascal and Ebon Moss-Bacharach (Picture: Getty Images)
Ebon Moss-Bachrach as Ben Grimm/The Thing, Vanessa Kirby as Sue Storm/Invisible Woman, Pedro Pascal as Reed Richards/Mister Fantastic and Joseph Quinn as Johnny Storm/Human Torch, in a scene from "The Fantastic Four: First Steps wearing blue and silver outfits
Vanessa stars as Sue Storm, aka Invisible Woman (Picture: Marvel/Disney)

In the first of two post-credits sequences, Sue is shocked to find a menacing hooded figure looming over her young son, Franklin.

Fans will already know this to be the Fantastic Four’s longtime nemesis, Doctor Doom, who will be played by Robert Downey Jr. in the upcoming sequel, Avengers: Doomsday.

Although the villain’s face is obscured, Kirby has revealed that it was indeed Downey Jr. behind that hood.

‘Yeah! Robert’s never not been on set,’ she told Variety when asked whetherRDJ was present for the shoot.

Marvel Studios Panel At SDCC
Robert Downey Jr. will return to the MCU for next year’s Avengers: Doomsday (Picture: Getty Images for Disney)
SAN DIEGO, CALIFORNIA - JULY 27: Robert Downey Jr. speaks onstage during the Marvel Studios Panel in Hall H at SDCC in San Diego, California on July 27, 2024. (Photo by Jesse Grant/Getty Images for Disney)
The former Iron Man will play iconic comic book villain Doctor Doom (Picture: Getty Images)

She continued: ‘He’s always there. He is our leader. We call him our Godfather. He’s looked after us.

This sequence was filmed by the Russo Brothers as part of their work on Avengers: Doomsday and shot while Kirby was pregnant in real life.

‘It’s such a joy working with the Russos and him, because they’ve had such deep collaboration for so long,’ she revealed.

‘And it’s been amazing being pregnant and working on Avengers. I felt so inspired and so relieved that I’ve been so taken care of. It’s been a really beautiful journey. Robert is just doing incredible work. I’m so excited.’

Editorial use only. No book cover usage. Mandatory Credit: Photo by Marvel/Disney/Kobal/Shutterstock (10213611ch) Robert Downey Jr. as Tony Stark/Iron Man 'Avengers: Endgame' Film - 2019 After the devastating events of Avengers: Infinity War (2018), the universe is in ruins. With the help of remaining allies, the Avengers assemble once more in order to undo Thanos' actions and restore order to the universe.
Downey Jr. played Tony Stark in the Avengers films (Picture: Marvel/Disney/Kobal/Shutterstock)

It was announced last year that Downey Jr. would be returning to the long-running franchise, six years after being killed off in Avengers: Endgame.

This came as Earth’s mightiest heroes faced off against purple menace Thanos (Josh Brolin) for the fate of the universe.

This spelt the end of Downey Jr.’s career-defining stint as Tony Stark—aka Iron Man—sacrificing himself at the end of the film to secure the future of reality as we know it.

Mandatory Credit: Photo by John Salangsang/Shutterstock (15405355qb) Vanessa Kirby 'The Fantastic Four: First Steps' World Premiere, Los Angeles, California, USA - 21 Jul 2025
Kirby was pregnant during filming of the upcoming Avengers sequel (Picture: Shutterstock)
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A few years later, it was confirmed that he would be returning, albeit in an entirely different role.

The actor’s appointment to the post was unveiled at last year’s Comic-Con, when a cloaked Downey Jr. removed his mask to reveal that he would be playing Doom, real name Victor von Doom.

This character was previously played by late Nip/Tuck actor Julian McMahon in the 2005 and 2007 films and by Toby Kebbell in the 2015 reboot.

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Doom’s brief appearance at the end of First Steps gives little away as to what he has planned, although we do know it involves Sue and Reed’s infant son.

He will spearhead a massive cast in Avengers: Doomsday, which is currently set for release on December 26, 2026.

Names already announced include Chris Hemsworth, Anthony Mackie, Sebastian Stan, Letitia Wright and Paul Rudd, as well as X-Men actors Sir Patrick Stewart, Sir Ian McKellen, Alan Cumming, Rebecca Romijn and James Marsden.

Of his return to the MCU, Downey Jr. joked: ‘New mask, same task.

‘What did I tell you? I like playing complicated characters.’

The Fantastic Four: First Steps is out in UK cinemas now.

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