Nitro

Nitro appears in Episode 8 of Wolverine and the X-Men, titled "Time Bomb". In this episode, Nitro goes to the Mutant Response Division (or MRD) willingly since he can't control his powers. In this it appears that he explodes at regular intervals, although before he does his body starts to crackle with electricity beforehand. The Brotherhood of Evil Mutants capture him so that he can be used as a weapon, but the X-Men stop them, as he will destroy Genosha if he is taken there. At the end of the episode, Nitro is locked away in the MRD facility once more.

Origin
Robert Hunter was born in Pennsylvania and spent decades as an electrical engineer. He was forced to retirement due to his old age, something he resented. Robert felt he was still strong enough to work. He operated a ham radio for a while, broadcasting his frustration. That is how the Kree located him. Due to genetic alteration carried out on him by the Kree Lunatic Legion, Robert gained the ability to explode and reform himself at will.

Power and Abilities
Nitro can cause himself to explode and reform from a gaseous to solid state at will. He can also channel his explosive powers into his hand and smash walls with ease. The flaws in his power is that he must gather his gaseous form before becoming solid again. If a part of his gaseous form is somehow contained or separated from him, he cannot turn solid until he merges with it. His explosive powers also do not affect those in very close proximity of him.