I originally liked Mark because I enjoyed his humour and while he was part of "Helen's gang, " he didn't seem to be under her thumb or even afraid of her, really. He and Helen seemed to have a good "understanding." However recently Mark's behavior has changed--or at least he has fallen into some bad decisions. And I don't like the way he is--again more recently--treating Christopher. Mark is hearing the cheers from the BB crowd and it is perhaps going too much to his head (?). I don't know. That seems to be the downfall of a lot of past housemates. Anyway, we'll see.