Six months after defeating the Daughters of Atlas, Billy Batson is finally comfortable as both a hero and a foster brother — but his world shatters when the ancient, ruthless Black Adam escapes his cosmic prison, seeking not revenge on Shazam, but the one thing Billy never expected: an alliance. Synopsis:

Adam kidnaps Darla, the youngest, to force the family’s cooperation. Billy, desperate and enraged, almost kills a human soldier — stopping himself at the last second. Freddy pulls him back: “That’s the line, Billy. Don’t cross it.”

But Adam’s patience snaps when a rogue government agency (ARGUS, implied) attacks him with magical dampeners. Adam retaliates — leveling a city block. Casualties mount. The media turns on the Shazam family for “not stopping him sooner.”

Billy confronts Adam. Their first fight is brutal: Shazam’s lightning does nothing to Adam (he’s immune — same source). Adam overpowers him, breaks his jaw mid-transformation, and whispers, “You are not a god. You are a child with a toy.”

Broken, Adam lashes out. Billy doesn’t kill him. Instead, he says, “You wanted vengeance. I’d want the same. But I won’t let you burn the world for a ghost.”

Final battle at the Philadelphia Museum of Art (the “Rock of Eternity” gate location). The Shazam family works as a unit — Mary and Eugene disrupt Adam’s power absorption, Pedro and Darla free civilians, Freddy outsmarts Adam’s magic. Billy uses his heart: he lets Adam open the door to the underworld.