The Failed Lecturer from the Future

A physicist from the future travels back in time, posing as an ordinary lecturer. After shocking the world by igniting cold fusion and revolutionizing his university with advanced AI, he heads to the war-torn border. Armed with medical nanobots and a devastating humanoid mech, he crushes the enemy forces overnight. But just as he returns in triumph, an urgent call brings chilling news: the four-dimensional beings he thought he left behind have reappeared.