JASON REITMAN as the director RACHEL MCADAMS in the role of Buttercup, originated by Robin Wright CATHERINE REITMAN and later GAEL GARCÍA BERNAL(delayed) in the role of Inigo Montoya, originated by Mandy Patinkin DONALD GLOVER in the role of Vizzini, originated by Wallace Shawn CHRIS O'DOWD in the role of Count Rugen, originated by Christopher Guest GAGE MUNROE in the role of the grandson, originated by Fred Savage GEORGES LARAQUE in the role of Fezzik, originated by André the Giant PATRIC STEWART in the role of Prince Humperdinck, originated by Chris Sarandon ROB REINER in the role of grandfather, originated by Peter Falk and original director AND: CARY ELWES in the role of Westley, originated by Cary Elwes