The main villain in the Marvel Cinematic Universe film Thunderbolts (2025) is The Void, a dark and powerful entity that exists within Robert "Bob" Reynolds, also known as the Sentry. The Void is essentially the evil alter ego of Sentry, representing a split personality where Sentry is the heroic side and The Void is the malevolent force. This entity possesses immense powers such as superhuman strength, speed, flight, and energy projection, making it stronger than all the Avengers combined. Throughout the film, The Void emerges as the primary threat, turning people into shadows and causing widespread destruction
. Robert Reynolds struggles with this duality, as The Void takes control and acts as the villain, while Sentry is the good persona. The character's complexity is rooted in his mental health issues and split personality, with The Void being the manifestation of his darker side. Valentina Allegra de Fontaine also plays a role in the story, but her motivations remain unclear
. In summary, The Void is the central villain in Thunderbolts , embodied by Robert Reynolds/Sentry's darker self.
