Born on Dryad in the 30th century from human parents, Wi Kan Muur was recruited and given super-analytical faculties as well as the ability to nullify the powers of its opponents by the Dark Man to serve in his League of Super-Assassins. He lost the use of his legs in the destruction of Dryad and used an anti-gravity chair to move.
After the defeat of the Super-Assassins, Neutrax joined the Legion of Super-Villains in two of their biggest campaigns against the Legion of Super-Heroes.
He is the most cold-blooded and powerful member of the League of Super-Assassins.