Mass Master ("Alex Power")

 The real name of the protoplasmic servant chosen to impersonate Alex Power is unrevealed, as are its power set. As "Alex", he had all of the real Alex's memories and desires (such as his crush on girlfriend Alison), plus the usual worries of a thirteen-year-old boy going through puberty. He retained the belief he was Alex Power even after his body reverted back to its original appearance. His powers in his original form are unrevealed. As "Alex", he had control over his body mass, able to go cloudy at will or shrink down to around six inches or so. Before being seemingly destroyed he began to develop a healing power he could use on others, and could create a density field to protect himself and others from attacks. Supposedly he could teleport as well, but that was never shown, just alluded to. He was also able to hear a mysterious "voice from beyond" who gave him advice and encouragement when he really needed it. (Originally the voice was supposed to be the ghost of Whitey, the Kymellian who gave his powers to the Power children at the cost of his own life (waaaaay back in Power Pack I#1), but with the retcon that this Alex was a fake one, who that voice really was can now be assumed to be a different Kymellian altogether, I think.)