Fan Casting Justin Hammer in Iron Man: Demon in a Bottle

Billionaire and founder of Hammer Industries, a weapons manufacturer who's the rival company of Stark Industries. He developed technology with the ability to hack into the system of Tony's Iron Man suit, and he used this tech to further damage Tony's reputation when Hammer firesa off Iron Man's repulsors and kills an innocent bystander. He uses this incident to smear more dirt onto Stark Industries in hopes to become the wealthiest billionaire within the tech industry in America. Tony manages to prove that his suit was sabotaged and leads to him finding out the identity of the saboteur and he eventually squares off with Hammer in a battle where Tony prevails.