This is a film about people who have been used and discarded by systems that promised them purpose. Yelena Belova destroys a lab in Kuala Lumpur because Valentina Allegra de Fontaine told her to. She's working off her sister's death, trying to find meaning in black ops work. Bucky Barnes is pardoned but directionless. John Walker was stripped of the Captain America title and is desperate to prove he deserves a second chance. Alexei Shostakov wants his daughters to be proud of him. Ava Starr is still phasing in and out of existence, barely holding together. Taskmaster is a weapon without a target.
Valentina has been assembling them, one mission at a time, and they don't realize she's preparing to burn them all. She's involved with the O.X.E. Group's Sentry project—an attempt to create a superhuman as powerful as Captain America or the Hulk. The project is illegal, dangerous, and her fingerprints are all over it. The Thunderbolts are loose ends, and Valentina has designed a mission that will eliminate them.
They figure it out when the mission becomes a kill box. These broken operatives who barely trust themselves have to trust each other to survive. Bucky, decades of experience as the Winter Soldier, takes tactical lead. Yelena refuses to die for someone else's agenda. Walker fights like a man who has something to prove. They escape but they're fugitives now, hunted by Valentina's other assets.
The Sentry program has created someone—Bob Reynolds—whose powers are god-like and whose stability is nonexistent. Valentina plans to unleash him as a controllable weapon. The Thunderbolts decide to stop her, not because it's heroic but because she tried to kill them and that requires a response.
The final battle involves fighting both Valentina's forces and preventing Sentry from leveling a city when his powers overload. Ghost phases through his containment. Taskmaster uses his own combat patterns against him. Bucky talks Bob down—one mind-controlled weapon to another—and Bob chooses to neutralize himself rather than become what Valentina wants.
Valentina escapes prosecution but loses her leverage. The Thunderbolts are offered jobs, oversight, rehabilitation. They refuse. They take the name "New Avengers" instead—a team of people who have done terrible things trying to do better. Not redemption arcs gifted from above, but something they're building themselves, one questionable decision at a time.
The asterisk in the title becomes clear: they're not Thunderbolts, villains pretending to be heroes. They're something messier and more real—people who have been weapons deciding to be human.
The film understands that not every hero has a clean origin. Some start as villains, some as victims, some as soldiers following orders they shouldn't have followed. What matters is the choice to be better when the systems that made you won't let you be anything else. The Thunderbolts—the New Avengers—are that choice embodied.