Christopher Reeve's children Alexandra, Matthew and Will were a united front at the New York premiere of the documentary honoring their late father. See all the red carpet photos

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.

Armed with home videos and interviews with Reeve's family and closest friends, "Super/Man: The Christopher Reeve Story" gives a powerful and honest look at the man who played a hero, and then became one after a devastating horse-riding accident left him paralyzed nearly 30 years ago.

Christopher Reeve is the perfect Clark Kent / Superman, and no matter how hard any actor tries, no one will be able to bring to the character what Reeve brought to him. It was truly something special,

The late Christopher Reeve's children stepped out together for the premiere of "Super/Man: The Christopher Reeve Story," which explores the legacy of their beloved father. The documentary follows Christopher Reeve's life as he became the iconic "Superman" character and after he was paralyzed in a near-fatal horse-riding accident in 1995.

Super/Man: The Christopher Reeve Story does deeply moving and thoughtful work providing a tribute to a cinema legend