Aerospace Engineering, Mechanical Engineering, Electrical Engineering, Computer Science and Nuclear Engineering. Now going into specifics, here are the items that you see in the movies and how they are related: Designing and building the arc reactor will take knowledge in plasma physics, magnet design, nuclear physics, electrical power extraction, and radiation shielding/reflector design. Also, since it is a power source for a flight vehicle (Iron Man’s suit) knowledge of aircraft design is also needed since it would help design the power demand curves from the reactor. Building this in a cave like Tony Stark does would also require good knowledge of chemistry and mechanics of materials as it would inform him how to fabricate the components and assemble them with the needed tolerances for making it work. The designing and building the iron man suits is mostly aerospace and mechanical engineering, namely aircraft design. The suit control surface positioning...