Nitro

Nitro is a fictional character, a supervillain in the Marvel Comics universe. He first appeared in Captain Marvel #34 (September 1974) and was created by Jim Starlin. Nitro is best known for being part of the tragedy that started off Marvel's Civil War crossover. He is also known by comic fans for playing a part in the death of the Kree superhero Mar-Vell. Robert Hunter was born in Scranton, Pennsylvania. He was an electrical engineer. Due to genetic alteration carried out on him by the Kree Lunatic Legion, Robert gained the ability to explode and reform himself at will and became a professional criminal. Some time later, he exposed Captain Marvel to a carcinogenic nerve gas; this encounter ultimately caused Marvel's fatal cancer. Since then he has clashed with Earth's superhumans, who have found creative ways to defeat him, including using the "fractioning (separation) of his exploded mass" against him (essentially, if he can't reform himself after an explosion, he can't explode... full article at wikipedia