Marvel Studios’ upcoming film, Thunderbolts*, is poised to unveil an intriguing aspect of Doctor Doom’s legacy, according to speculation circulating in the Marvel fan community. As the concluding film of the MCU’s Phase 5, Thunderbolts will introduce a dynamic ensemble of antiheroes and reformed villains. This group will face off against one of Marvel’s most formidable new characters: Bob, portrayed by Lewis Pullman. Notably, this character straddles the line between hero and villain, presenting a critical challenge to the MCU, particularly as Pullman’s story continues in the upcoming Avengers: Doomsday.
The trailers for Thunderbolts* have highlighted the risks posed by Pullman’s character, the Sentry, especially his darker persona. The Sentry, known as one of the most potent figures in Marvel Comics, will undoubtedly serve as a daunting opponent for the Thunderbolts team—which includes characters like Yelena Belova, Red Guardian, Bucky Barnes, Ghost, Taskmaster, and US Agent. His immense powers may also lead to significant implications in future MCU projects, specifically in Avengers: Doomsday, where there are suggestions that Doctor Doom may seek to manipulate the Sentry’s powers for his own nefarious purposes.
The Thunderbolts’ Victory Over Sentry: An In-Depth Look at the MCU Theory
Lewis Pullman as Robert Reynolds’ Sentry: A Game Changer in Thunderbolts*





It appears nearly certain that Robert Reynolds will transition into the Sentry under the guidance of Valentina Allegra de Fontaine in Thunderbolts*. However, his transformation into the sinister Void could complicate matters, as it may stir feelings of vengeance against Valentina and even threaten the safety of New York City. Trailers suggest the Void’s destructive capabilities, showcasing him turning innocent bystanders into shadows, foreshadowing potential large-scale casualties and moral dilemmas throughout the Phase 5 film.
With Lewis Pullman confirmed to reprise his role in Avengers: Doomsday, it is plausible the Thunderbolts will devise a plan to revert the Void back to the Sentry. However, this success will come with haunting repercussions as Robert Reynolds must contend with the aftermath of the Void’s actions, potentially causing hundreds of fatalities. This weight of guilt could prompt Reynolds to adopt a lone-wolf mentality, reminiscent of the Scarlet Witch’s path post-WandaVision, resulting in fascinating narrative possibilities for the character’s arc in the MCU’s Phase 6.
Sentry’s Isolation: A Path to Doctor Doom’s Manipulation
Harnessing Power: Robert Downey Jr.’s Doctor Doom Eyeing The Sentry in Avengers: Doomsday

Speculation suggests that the Sentry’s isolation could set the stage for Doctor Doom’s strategic manipulation, a theory proposed by Reddit user CottonBUdy12. With Robert Downey Jr. confirmed to portray Doctor Doom at the 2024 San Diego Comic-Con, it is vital for Doom to establish a strong presence early on in Avengers: Doomsday. Gaining control over the immensely powerful Sentry would provide an effective means to debut his menace, directing the Sentry against the MCU’s heroes.
Short theory on Thunderbolts, Sentry & Doom by u/CottonBUdy12 in MCUTheories
In the Marvel Comics, the Sentry is often depicted as wielding the power of a million exploding suns, establishing him as one of the most formidable super-soldiers. Should this hold true for the MCU, Robert Reynolds could become a central figure that various villains might covet, either to exploit or to conquer. With Doctor Doom positioned as a leading antagonist for the Multiverse Saga, it seems likely that he will leverage the Sentry’s powers to orchestrate chaos, posing a grave threat to the Avengers.
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The Return of the Sentry in Avengers: Doomsday as a Catalyst for the MCU’s Secret Wars

The Russo brothers have consistently expressed their enthusiasm for the Secret Wars arcs within Marvel Comics, hinting that both the 1984 and 2015 events will inform the MCU’s forthcoming Doomsday and Secret Wars narratives. This suggests a potential storyline transformation of Doctor Doom into “God Emperor Doom”on Battleworld, augmented by his ability to control the Sentry’s formidable powers. A scenario in which Robert Reynolds inadvertently decimates a portion of the MCU’s heroes may instigate an incursion event, positioning Doom to create Battleworld and providing a compelling rationale for these epic developments.
Recent trailers for Thunderbolts* have showcased Valentina Allegra de Fontaine’s claim that the Sentry is “stronger than all the Avengers combined,”hinting at an ultimate clash between the Sentry—and possibly the Void—and the Avengers that could lead to catastrophic outcomes for Earth’s Mightiest Heroes. Such a devastating event would likely trigger an incursion, laying vital groundwork for Doctor Doom’s ambitions in both Avengers: Doomsday and Secret Wars.