Transmigrated into the Marvel Universe as Tony Stark, college student Jack faces his ultimate trial against Thanos, only to fall in devastating defeat. Yet reincarnation defies death itself—he awakens as a newborn in Wayne Manor, consciousness intact and memories unbroken. As Bruce Wayne, Jack engineers his own path to legend, forging a vigilante that merges Batman's merciless shadow with Iron Man's technological mastery. DC's primitive technology pales before his vision, spurring him to introduce revolutionary innovations to a world centuries behind Marvel's frontier. Through dangerous alliances, moral ambiguity, and the ruthless choices that separate heroes from myths, Jack ascends beyond both identities, reshaping civilization itself through intellect and will.