What happens behind these walls will change everything.

When we think back on the magic of Good Will Hunting, it's not just the stirring ... whose performance as Sean Maguire remains unforgettable. But what was it like behind the scenes?

With a different cast, Good Will Hunting might not have been a success ... Will can stay at MIT if he gets therapy from Sean Maguire, played by Williams. And that therapy is where the huge ...