TThe survivors in Lost are all strangers to each other. Even the blood relatives...
Michael is Walt's father - a construction worker from New York who once dreamed of becoming an architect. When his girlfriend gave birth to his son he gave up these dreams to support his young family.
And then found his girlfriend was leaving him for another man.
Years later, her sudden death leaves him flying to Australia in the company of Walt, the son he hasn't seen in years. And this isn't turning into the kind of father/son bonding trip he had in mind...