An experimental serum called Extremis gets stolen, and Iron Man rockets into action. The ensuing battles test Stark's spirit and Iron Man's power. Based on the graphic novel of the same name... Read allAn experimental serum called Extremis gets stolen, and Iron Man rockets into action. The ensuing battles test Stark's spirit and Iron Man's power. Based on the graphic novel of the same name.An experimental serum called Extremis gets stolen, and Iron Man rockets into action. The ensuing battles test Stark's spirit and Iron Man's power. Based on the graphic novel of the same name.