Thunderbolts MCU: Eric Pearson Reveals Surprising Villain Swap and What It Means for Marvel’s Future

Marvel Studios’ Thunderbolts has stormed into theaters, delivering unexpected twists, powerful character arcs, and one major reshuffling of the Marvel Cinematic Universe (MCU). At the heart of it all is co-writer Eric Pearson, who recently sat down with IGN to share behind-the-scenes insights, including an original villain that never made it to the final cut—and how the team’s emotional journey shaped the story’s ending.

The Original Thunderbolts Villain Wasn’t the Sentry

Although Thunderbolts introduces Robert “Bob” Reynolds, aka the Sentry, as the team’s final boss and emotional antagonist, that wasn’t always the plan. According to Pearson, early drafts had John Walker (Wyatt Russell)—a.k.a. U.S. Agent—becoming a “punching villain” manipulated by Valentina Allegra de Fontaine. Her plan involved deceiving Walker into thinking his super-soldier serum required “maintenance,” which would trigger a volatile transformation reminiscent of the Red Hulk.

“We had him essentially ‘Hulk out,’ but it felt off,” Pearson explained. “Another Marvel film, Captain America: Brave New World, was already introducing Red Hulk. I didn’t want to end this movie with another punch-out.”

Instead, Pearson chose to end with something rare in superhero cinema: a group hug. This pivot brought in the Sentry—and his dark counterpart, the Void—as a symbolic manifestation of the characters’ emotional turmoil.

Emotions Over Explosions: The Sentry as an Emotional Villain

By swapping John Walker for the Sentry, the story deepened. Sentry’s internal conflict with the Void reflects the trauma and duality many Thunderbolts characters carry.

“If self-esteem is on one side and depression on the other, then the Sentry embodies all our characters’ struggles,” said Pearson.

The climactic showdown doesn’t end in destruction—it ends in empathy. The Thunderbolts dive into the Shadow Realm and reach Bob through compassion, not combat. The moment is capped with Valentina dubbing them the New Avengers, giving the misfit team a shocking new identity.

From Drafts to the Big Screen: What Almost Happened

Interestingly, many familiar Marvel faces almost joined the film. Early versions included:

• Baron Zemo

• Kang the Conqueror

• Bill Foster (Laurence Fishburne) from Ant-Man and the Wasp

But as the script evolved, so did its focus. “It was always about Yelena Belova’s journey,” Pearson revealed. “That naturally brought in characters like Red Guardian and Ghost.”

That Fantastic Four Cameo – What Does It Mean?

The film’s post-credits scene delivers what fans have been waiting for: the Fantastic Four entering the MCU. A spacecraft with a glowing “4” appears, hinting at their crossover from another timeline.

Pearson, also writing Fantastic Four: First Steps, confirmed that this connection was added later during production. “It wasn’t originally how the FF would arrive in the Sacred Timeline,” he said. “But now? It sets up a massive chain reaction for Avengers: Doomsday and Secret Wars.”

Why Bucky’s a Congressman… and Why It Doesn’t Matter

One head-scratching moment for fans is Bucky Barnes being revealed as a congressman. The idea wasn’t Pearson’s.

“That came after my drafts,” he said. “Originally, Bucky was more like a PR mascot for politicians—just shaking hands. But secretly, he was investigating Valentina from within the system.”

Still, it’s unclear if he’s still in Congress by the time he joins the New Avengers.

What’s Going On With Sam Wilson?

Another twist: Sam Wilson (Captain America) is blocking the New Avengers from officially using the “Avengers” name. A mid-credits scene reveals that Sam hasn’t exactly welcomed the Thunderbolts’ rebrand.

Why the hostility? Pearson doesn’t offer a definitive answer, but it suggests a brewing tension that could set the stage for a Civil War-style clash in Avengers: Doomsday.

Will There Be Two Competing Avengers Teams in the MCU?

With Sam reportedly building his own team and the Thunderbolts becoming the New Avengers, Avengers: Doomsday may pit two factions against one another before uniting against a larger threat—perhaps Doctor Doom, who’s been rumored to be played by Robert Downey Jr. in a variant role.

Meanwhile, the X-Men remain a mystery… for now.

Did Marvel Just Spoil the Fantastic Four’s Movie Ending?

The arrival of the Fantastic Four at the end of Thunderbolts has fans speculating whether First Steps will end with their timeline jump into the main MCU. Pearson kept it vague but hinted, “They’ll steer the MCU ship for a bit—but this universe is too big for any one team.”

Thunderbolts doesn’t just shake up the MCU—it reshapes the emotional core of what a Marvel team-up movie can be. With the introduction of the Sentry, a multiverse connection to the Fantastic Four, and teases of internal conflict among the Avengers, Thunderbolts sets the stage for a sprawling and emotionally rich MCU Phase 6.