Hulkbuster is a powerful suit of armor designed by Tony Stark, also known as Iron Man, in the Avengers series. It was created to combat the Hulk, should he become uncontrollable. The suit is equipped with immense strength, durability, and advanced weaponry, making it a formidable opponent. Hulkbuster plays a crucial role in the series when the Avengers face internal conflicts or when the Hulk's destructive power poses a threat. Its iconic design represents Stark's ingenuity and the constant need for preparedness against unpredictable threats.