Tim Blake Nelson's return as Samuel Sterns/The Leader in Captain America: Brave New World is a significant event, especially considering his last appearance in 2008's The Incredible Hulk. While initially surprising to see The Leader positioned as a Captain America antagonist rather than a Hulk adversary, this unexpected pairing is precisely what makes the storyline compelling. The Leader's unparalleled intellect poses a unique threat to Sam Wilson, a challenge unlike any he's faced before.
The Leader's origin story, as depicted in The Incredible Hulk, established him as a brilliant cellular biologist who, after exposure to gamma radiation, experienced a dramatic increase in intelligence. This transformation, however, didn't immediately turn him into a villain. Initially an ally to Bruce Banner, Sterns' ambition to harness the power of gamma radiation for humanity's benefit ultimately led him down a darker path. The film's ending, showing Sterns' physical transformation after exposure to Banner's blood, hinted at his future as a formidable foe.
Marvel's decision to utilize The Leader in a Captain America film, rather than a standalone Hulk movie, is likely due to Universal Pictures' partial ownership of the Hulk film rights. This strategic move allows for the continuation of The Leader's storyline within the existing MCU framework. The Leader's potential motivations in Brave New World could stem from a desire for revenge against General Ross, now portrayed by Harrison Ford, for his past involvement in Sterns' transformation. This could lead to a conflict with Captain America, as The Leader seeks to undermine the American government and its symbol of heroism.
Director Julius Onah highlights the unexpected nature of The Leader's threat as a key element of the narrative. Sam Wilson's leadership will be tested in a post-blip, post-Thanos world, facing a villain whose intelligence surpasses brute strength. This conflict is not merely a prelude to the next Avengers movie but may also set the stage for the Thunderbolts film, suggesting The Leader's actions could significantly impact the MCU's future. The Leader's potential to dismantle the Captain America symbol and usher in a darker era for the MCU adds another layer of intrigue to his role in Captain America: Brave New World.