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.

On the red carpet, he was asked about his cameo in the film, which he described as a "nice full circle moment" for long-term fans o