Jeremiah Muldoon was abandoned in a military base shortly after birth. A couple living on the base took him in and raised him. As an adult, Muldoon joined the military. His green skin and obvious mutant features isolated him among his comrades, so he found himself transferred from one department to another. He eventually found a home among the Sentinel Squad O*N*E, a group of military employees operating gigantic Sentinels assigned to protect the last remaining mutants. There he met Alexander Lexington, a fellow mutant who unlike Meld, was able to hide the fact that he was a mutant. The two quickly bonded and Meld even helped Lexington keep his secret from their teammates.
During one of the group's missions, Meld opted to leave the team to care for orphaned mutants in Ecuador. To explain his sudden departure, his teammates faked his death, allowing him to do good for his fellow mutants.
Meld was one of the few mutants to retain their powers after M-Day, when the Scarlet Witch removed 90-98% of the mutant population's powers.
Meld is next seen alongside mutants protesting Simon Trask's Proposition X as well as a city-wide curfew set by Norman Osborn, following a chaotic riot between a lynch mob of humans and pro-mutant activists. He and his group decide to attack the H.A.M.M.E.R. soldiers that patrolled the city before they were quickly taken down by Emma Frost and the government-approved Dark X-Men.
During the events of Necrosha, Meld was killed by Senyaka, who strangled him from behind.
Powers and abilities
Meld is a mutant capable of liquifying and reshaping metal through physical contact.
He is in peak physical condition and received various amounts of training during his time with the military.
As a pilot for Sentinel Squad O*N*E, he had heightened strength, size, and durability of the Sentinel exoskeleton and had a variety of weaponry and gadgets at his disposal, including laser rays, nets, and smoke bombs. The Sentinel was also capable of flight via jets placed on the boots of the robot.