The Marvel Cinematic Universe (MCU) is gearing up for one of its most intriguing team-up films yet— Thunderbolts . Unlike traditional superhero squads, this group consists of antiheroes, reformed villains, and morally gray characters, making their first major cinematic appearance in this highly anticipated movie. With a team that includes Yelena Belova, Bucky Barnes, Red Guardian, and U.S. Agent, fans are eager to know who they will be facing.
So, who is the main villain in Thunderbolts ? Marvel Studios has kept many details under wraps, but leaks, interviews, and industry reports have given us some strong clues. Let’s take a closer look at the antagonist that will challenge this unconventional team.
Who Is the Main Antagonist inThunderbolts?
Marvel hasn’t officially confirmed the primary villain, but multiple reports suggest that the Thunderbolts will go up against a powerful character played by Steven Yeun. His rumored role? None other than Sentry—a character with immense abilities, often compared to Marvel’s answer to Superman.
Sentry’s inclusion in Thunderbolts would be a game-changer for the MCU. His raw power, complex psychology, and connection to another dangerous entity—the Void—could make him one of the most formidable foes this team has ever faced.
Why Sentry?
Steven Yeun’s casting in Thunderbolts has been one of the biggest mysteries surrounding the film. Early rumors linked him to Robert Reynolds, also known as Sentry, a superhero with near-godlike abilities. In the comics, Reynolds gained his powers from an experimental serum that made him one of the strongest beings in the Marvel Universe. However, this power came with a dark side—the emergence of his evil alter ego, the Void.

Sentry (Image via Getty)
If Thunderbolts follows the comics, Sentry’s role could be far more tragic than that of a traditional villain. Rather than a simple antagonist, he might be a government-controlled asset that spirals out of control, forcing the team to confront an enemy unlike any they’ve faced before.
Sentry’s Potential Role inThunderbolts
Given that the Thunderbolts team consists of antiheroes working for the U.S. government, it’s possible that Sentry was created as part of a secret military experiment. If something goes wrong, the government could send the Thunderbolts to neutralize him.
This setup would fit Marvel’s pattern of introducing villains with personal conflicts rather than straightforward evil motives. If Reynolds struggles with the Void’s influence, the Thunderbolts might be dealing with a character who is both a threat and a victim.
Other Possible Villains inThunderbolts
While Sentry is the most likely main antagonist, there are other characters who could play a significant role in the conflict.
Julia Louis-Dreyfus’ Valentina Allegra de Fontaine has been assembling a team of questionable characters since The Falcon and the Winter Soldier . As the leader of the Thunderbolts , her true motives remain unclear. Could she be manipulating the team for her own agenda?
It wouldn’t be surprising if Valentina turns out to be pulling the strings behind the scenes, using the Thunderbolts to eliminate a threat she helped create. If she has knowledge of Sentry’s true power, she might be orchestrating events to serve her own interests rather than those of the government.
With Harrison Ford stepping into the role of Thaddeus “Thunderbolt” Ross, many fans have speculated about the possible introduction of Red Hulk. In the comics, Ross transforms into a red-skinned, rage-fueled version of the Hulk after undergoing a gamma radiation experiment.
Since Ross has a history of trying to control super-powered individuals, it’s possible that he plays a role in the creation of Sentry or another super-soldier experiment. If things go wrong, he could either become an antagonist himself or step in to battle Sentry alongside the Thunderbolts .

Thunderbolts (Image via Getty)
Marvel has a tendency to introduce villains who are part of a bigger picture. While Sentry or the Void may be the immediate threat, there’s always a chance that Thunderbolts sets up a larger antagonist for future MCU projects. Characters like the Leader (last seen in The Incredible Hulk and rumored to return in Captain America: Brave New World ) or Doctor Doom could be lurking in the background, influencing events without revealing their full intentions.
How Will theThunderboltsHandle Such a Powerful Opponent?
If the Thunderbolts are truly facing Sentry, they have a serious challenge ahead. Unlike the Avengers, this team is made up of fighters who rely on skill, strategy, and military training rather than overwhelming superpowers. So, how could they possibly take on a being as powerful as Sentry?
One of Sentry’s biggest weaknesses is his unstable mind. His internal battle with the Void makes him vulnerable to psychological manipulation. Characters like Yelena and Bucky, who have dealt with brainwashing and trauma, might try to use their own experiences to break through to Reynolds and help him fight the Void’s control.
If Ross becomes Red Hulk, we could see a clash between two incredibly strong beings. Red Hulk’s raw strength and military strategy might be one of the few things that can hold Sentry back while the rest of the team works on another way to stop him.
Marvel loves emotional sacrifices, and if Sentry is truly out of control, one of the Thunderbolts might have to make a difficult choice to stop him. This could lead to a major character death, changing the team dynamic for future films.

Sentry (Image via Getty)
What This Means for the MCU’s Future
Thunderbolts is shaping up to be one of the most unique films in Marvel’s lineup. Instead of heroes banding together to stop a villain, we have a team of misfits dealing with a dangerous situation that may be beyond their control.
If Sentry is indeed the main antagonist, his introduction could have massive consequences for future MCU stories. Whether he survives the events of the film or not, his presence could set up larger cosmic or supernatural threats down the line.
Meanwhile, characters like Valentina and Ross are likely to continue playing major roles in the government’s handling of super-powered individuals. With the MCU moving toward more morally complex stories, Thunderbolts could be a turning point that redefines how the franchise handles antiheroes and government-controlled teams.
Marissa Cooper’s death in The O.C. remains one of the most heartbreaking moments in television history. Fans who watched the show from the beginning saw her go through numerous ups and downs, but nothing could prepare them for the devastating season three finale. Her passing not only changed the course of the series but also left a lasting impact on viewers.
Her character, played by Mischa Barton, was central to The O.C. ‘s story, making her exit all the more emotional. Whether you’re a longtime fan revisiting the series or someone just discovering it, understanding how and why Marissa met her end is essential to grasping the full weight of her journey.

The O.C. (Image via Getty)
Marissa Cooper’s Turbulent Journey
From the very first episode, Marissa is portrayed as the troubled yet intriguing girl next door. She was beautiful, wealthy, and popular but carried deep emotional struggles beneath the surface. Growing up in Newport Beach, California, she had a life that seemed perfect from the outside. However, behind the glamour, she dealt with family issues, toxic relationships, and personal demons.
Throughout the series, Marissa endured:
- Her parents’ messy divorce
- Her father Jimmy’s financial struggles
- A dysfunctional relationship with her mother, Julie Cooper
- A rocky romance with Ryan Atwood
- Substance abuse problems
- An abusive relationship with Trey Atwood, Ryan’s brother
Despite everything, she remained a fan favorite due to her complex personality and deep emotional struggles. Many viewers related to her pain, making her eventual fate even more difficult to accept.
What Led to Marissa’s Death?
Marissa’s storyline in season three took a darker turn. After being expelled from Harbor High, she attended a public school, where she struggled to adjust. She later became involved with Volchok, a rebellious and dangerous surfer who had a bad influence on her. Their relationship was toxic, filled with reckless behavior, partying, and betrayals.
Things escalated when Volchok cheated on Marissa, leading her to cut ties with him. However, he couldn’t let go. Desperate, angry, and spiraling out of control, Volchok made a series of bad decisions that ultimately resulted in tragedy.
The Fatal Car Crash
In the season three finale, “The Graduates,” Ryan and Marissa decide to leave Newport together. After attending their graduation, they plan to head to the airport, where Marissa is supposed to start fresh with her father, Jimmy, in Greece. It’s a hopeful moment—one that suggests Marissa might finally escape her troubled past.
However, as Ryan drives her along a winding road, Volchok appears, chasing them in his car. Fueled by jealousy and rage, he begins to harass them on the road, getting dangerously close. Ryan tries to avoid him, but Volchok forces them off course. Their car crashes, flipping over and landing in a ditch.

Marissa Cooper (Image via Getty)
Ryan manages to crawl out and rescue Marissa from the wreckage just before the vehicle catches fire. As he carries her to safety, it becomes clear that she’s gravely injured. Lying on the ground in Ryan’s arms, Marissa’s injuries prove to be too severe. She shares a few final words with Ryan, reminiscing about their past before she dies in his arms. The episode ends with Ryan walking away from the burning car, carrying her lifeless body, as Hallelujah by Imogen Heap plays in the background—a haunting and unforgettable moment for fans.
Why DidThe O.C.Kill Off Marissa?
Marissa’s death was a creative decision that changed the direction of the show. There were multiple reasons behind it:
One of the biggest factors was Mischa Barton’s decision to leave The O.C. . In interviews, she mentioned that she felt it was time to move on from the character and explore other opportunities. She later expressed regrets about how it was handled, but at the time, leaving seemed like the best option for her career.
The show’s creators wanted to introduce a dramatic shift going into season four. Killing off a main character was a bold move that amazed audiences and set a darker tone for the final season. However, some fans felt that the show was never the same without Marissa.
By season three, The O.C. was struggling with declining viewership. The writers hoped that a twist would bring renewed interest, but it didn’t have the long-term impact they hoped for. Season four saw a further drop in ratings, leading to the show’s cancellation after just 16 episodes.
How Fans Reacted to Marissa’s Death
Marissa’s death remains one of the most controversial moments in The O.C. . Many fans were devastated, feeling that her character deserved a better ending. Some argued that she had already suffered enough and should have been given a chance at a happy future. Others believed that her death added emotional weight to the series and made Ryan’s character arc even more profound.
The scene itself is often cited as one of the saddest deaths in TV history. The combination of Ryan’s heartbreak, the haunting soundtrack, and the realization that Marissa’s story was truly over left a lasting impression on viewers.
What Happened After Marissa’s Death?
Season four focused heavily on how Marissa’s death affected the characters, particularly Ryan. Struggling with grief, he isolated himself and sought revenge on Volchok, who fled after the crash. Seth, Summer, and the Cohens also struggled to cope with the loss. Summer, in particular, had a hard time moving forward, leading her to change her outlook on life and become more involved in activism.

Marissa Cooper (Image via Getty)
However, without Marissa, the show lost one of its central dynamics. Despite attempts to introduce new characters and storylines, The O.C. never fully recovered.
Mischa Barton’s Thoughts on Marissa’s Death
Over the years, Mischa Barton has spoken openly about her departure. In some interviews, she shared that she felt the show’s environment had become toxic for her. She also admitted that she was overwhelmed by fame at a young age and wanted to explore other roles. However, she later reflected that Marissa’s death was an extreme way to end her story and that other options could have been explored.
Marissa Cooper’s Legacy
Despite her tragic fate, Marissa remains one of the most iconic characters in teen drama history. Her journey resonated with audiences, and her death is still discussed years after the show ended.
Whether fans loved or hated how her story concluded, there’s no denying that Marissa’s impact on The O.C. was profound. Her struggles, relationships, and ultimate fate made her an unforgettable part of television history.