Hassad is the son of a skinny little miners representative and a sickly housewife from some backwater poor world. He began with a quite normal life as a boy, but suddenly began to growing in the most improbable of fashions, considering his father's frame. It earned him jokes, though only very shortly in front of him (the kids learnt quick, it wasn't a good idea to put this mountain of muscles into motion). A more accurate possibility is, that he was at some point given experimental drugs, which totally fucked up his endocrinal balance. Some sort of test baby in a way…
Whatever, his father died prematurely, leaving him the responsability of his sick mother, as well as a surviving brother (if I'm correct, one or two others died) and a little sister. He began then to use his sheer strength to pay the bills, whatever the ways. And dubious ways he walked, mark my words.
At some point, after having finished a long-term engagement with some organs dealers, his "bosses" told him to go "there" next, meeting some "colleagues-to-be" and accompany them "on some spaceship". Which he did, never asking why the fuck, just as he always did. For he is a family man, and family is for life. The rest is naught.