As a member of Gene Nation he grew up in the Darwinist world of “the Hill” ruled over by the mad mutant Mikhail Rasputin. It is unknown if he was in anyway involved in the first wave of gene nationals who arrived on Earth to kill humans on the eve of the Mutant Massacre or if he was one of the many transported from the hill by Mikhail under threat from the Morlocks former leader Storm.
What is known is that along with Vessel, Hemingway, Iron Maiden, Obsidian the black, fever pitch and integer they worked under Dark Beast who they identified as “the first”. Under his orders Membrain and his fellow gene nationals were placed in direct opposition to Generation-X. Membrain was pivotal to their success as he used his powers to make telepathic contact with the mutants and displayed their location to the others. He then single handedly took down Generation-X’s two most powerful members the mutants M and Synch.
Once they were returned to Dark Beast he camouflaged himself and waited a rescue team, unfortunately for him he was discovered by Emma Frost and with a quick psi-blast was rendered inert. He has not been seen since perhaps killed in the ensuing explosion or empowered by M-Day.