Iron Man's Arc Reactor NecklaceTony Stark, also known as Iron Man, built himself a suit which he named the Iron Man Mark, after which he is named. He is generally considered the one of the most powerful and to be fair, funniest superheros from the Avengers. His suit and at one point himself, is powered by a power core of pure energy known as the arc reactor. Your Provider of all Marvel Collectibles, Merchandise and Products here in South Africa!