The main villain in Thunderbolts* is the Void , the dark, destructive alter‑ego of the superhero Sentry (Robert Reynolds).

Who the villain is

  • The Void appears in the film as a shadow‑clad, immensely powerful entity that spreads darkness and preys on people’s fears and traumas.
  • In the comics and the movie, he is the corrupted side of Bob Reynolds / Sentry , a man who gained god‑like powers from an experimental “Super‑Soldier‑type” serum but also developed a split personality rooted in depression and instability.

How he fits into Thunderbolts*

  • In Thunderbolts* , the team—led by Valentina “Val” de Fontaine—is assembled partly to handle the threat posed by Sentry and his Void persona after he breaks loose and begins engulfing New York in supernatural darkness.
  • The film leans into the idea that the Void is not just a physical menace but a psychological one , trapping citizens in visions of their worst memories, which makes him a very different kind of villain from typical Marvel brawlers.

Why fans are talking about him

  • The Void has long been one of Marvel’s more psychologically complex antagonists, and his MCU debut in Thunderbolts* has become a major talking point on forums and social media.
  • Recent trailers and interviews frame him as the central big‑bad of the movie, tying together the team’s redemption arcs and the larger question of whether “damaged” heroes and villains can actually be trusted.

If you tell me whether you’re asking about the comics or the MCU movie , I can go deeper into the specific version of the Thunderbolts villain you care about.