http://www.imdb.com/title/tt0119217/

A janitor at MIT, Will Hunting has a gift for maths that can take him light-years beyond his blue-collar roots, but to achieve his dream he must turn his back on the neighborhood and his best friend. To complicate matters, two strangers enter the equation: a washed-up shrink who starts to coach Will through his transformation, and a med student who shows him that there can be a pretty face along with his life of the mind.
    
 Robin Williams ...  Sean Maguire 

 Matt Damon ...  Will Hunting 

 Ben Affleck ...  Chuckie Sullivan 

 Stellan Skarsgård ...  Prof. Gerald Lambeau 

 Minnie Driver ...  Skylar 

 Casey Affleck ...  Morgan O'Mally 

 Cole Hauser ...  Billy McBride 
 John Mighton ...  Tom 
 Rachel Majorowski ...  Krystyn 
 Colleen McCauley ...  Cathy 

 Matt Mercier ...  Barbershop Quartet #1 
 Ralph St. George ...  Barbershop Quartet #2 
 Rob Lynds ...  Barbershop Quartet #3 
 Dan Washington ...  Barbershop Quartet #4 
 Alison Folland ...  M.I.T. Student #1