The film could not have been made without the contributions of Reeve’s family, so it’s noteworthy when Reeve’s son Matthew opens up to the camera in the above, exclusive clip to discuss his favorite moment in his dad’s remarkable film career.

Christopher Reeve's oldest son Matthew Reeve tells PEOPLE at the New York City premiere of the documentary 'Super/Man: The Christopher Reeve Story' that his mother Gae Exton "is incredibly brave to tell her side of the story" of their family's history in the new movie.

Super/Man: The Christopher Reeve Story, from the filmmakers of McQueen, finds the real man beneath the cape. It makes him stand even taller.