Years after Tony Stark’s heroic sacrifice in Avengers: Endgame, the world still feels the absence of Iron Man. As global powers scramble to replicate Stark’s technology, Stark Industries becomes a battleground for espionage and innovation. At its center stands Harley Keener, the once-young boy from Iron Man 3, now a brilliant inventor guided by a holographic remnant of Tony Stark’s consciousness.

With the help of Riri Williams (Ironheart), Harley works to upgrade Iron Man’s tech and preserve Tony’s vision. Their journey leads them to an unfinished Stark protocol hidden deep within his archives — codenamed “LEGACY”, a failsafe designed to defend Earth from threats far beyond its current capabilities.

But darkness rises from the past. Ezekiel Stane, son of Obadiah Stane, resurfaces with stolen arc reactor tech and a malevolent A.I. built from corrupted fragments of Tony’s mind. His mission: dismantle Stark’s legacy from within and reshape it into a weapon of control.

As the world teeters on the edge of collapse, Harley must confront a defining choice: preserve the digital echo of Tony forever, or let Iron Man finally rest. In the climactic battle, Harley dons the Iron Man Mk Infinity suit — a fusion of Tony’s untested nanotech and Riri’s cutting-edge design — for a final stand against the corrupted vision of his mentor.

Iron Man 4 is a bold continuation of the legacy, blending emotional resonance with futuristic spectacle. As the arc reactor flickers for one final time, a new chapter begins… with Iron Man’s voice fading into memory.

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