Christopher Reeve’s appearance at theAcademy Awardsin 1996 is one eldest sonMatthew Reevewill never forget.

At theSundance Film Festivalon Sunday, the 44-year-old reflected on the emotional moment his father received a minutes-long standing ovation at the ceremony as he returned for the first time after his horse accident.

Getty Images; TIM CLARY/AFP via Getty Images

Matthew Reeve attends the “Super/Man: The Christopher Reeve Story” Premiere ; Christopher Reeve appears on stage at the 68th Annual Academy Awards

“I remember I was in London, it was a school night and we stayed up until three or four in the morning to watch it. And it was absolutely incredible,” Matthew told PEOPLE in an exclusive chat at the premiere of the documentarySuper/Man: The Christopher Reeve Story.

“And what sticks with me most was afterthat incredible warm welcomeand that very long ovation that he received, his introduction — he followed it up with a wonderful speech about how cinema and movies are at their best when they not only entertain, but they inform and educate and address issues," Matthew continues.

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He recalls that “they showed clips from a bunch of films,” like “Coming Home, andTerms of Endearmentand films that really address important human issues and made a call to action that Hollywood do more to do that.”

“So that’s always stuck with me," Matthew tells PEOPLE. “And that’s why also I feel like here, at Sundance, that’s what they do and that’s what they live for.”

Back in March 1996, Christopher was met with a standing ovation at the Oscars as he took to the stage in his first public appearance after his horse accident the year prior, which left him paralyzed from the neck down.

The actor appeared emotional at the reaction of the audience — which includedTom Hanks,John Travolta,Meryl Streep,Jim CarreyandNicholas Cage— as a curtain raised to reveal him onstage in a wheelchair, before introducing a film montage of Hollywood films tackling social issues.

Now, 20 years after Christopher’s death, comes the documentarySuper/Man: The Christopher Reeve Story,which recounts the legendary film career of theSupermanactor and the aftermath of his paralysis following the 1995 equestrian accident.

Matthew Reeve with late father Christopher Reeve in Germany on Oct. 22, 2003.Stefan Schnoor/Shutterstock

CHRISTOPHER REEVE AND SON MATTHEW WORLD AWARDS AT THE MUSIKHALLE, HAMBURG, GERMANY - 22 OCT 2003

Stefan Schnoor/Shutterstock

Reeve’s three children Matthew,AlexandraandWill Reevefeature in the film as they reflect on their father’s recovery after the spinal injury, and were also in attendance at the Sundance premiere on Sunday.

Filmmakers Ian Bonhôte and Peter Ettedgui worked closely with the Reeve siblings to glean a more complex understanding of Christopher’s legacy, his character and his family’s role in his recovery for the project.

Through weaving back and forth in time, the filmmakers also examined two key moments in Christopher’s life: his casting asClark Kentin 1978’sSupermanand the life-changing injury that left him quadriplegic in 1995.

Matthew, Alexandra and Will Reeve during the premiere ofSuper/Man: The Christopher Reeve Storyat the Sundance Film Festival in Park City, Utah, on Jan. 21, 2024.Michael Loccisano/Getty Images

Matthew Reeve, Alexandra Reeve Givens and William Reeve attend the “Super/Man: The Christopher Reeve Story” Premiere

Michael Loccisano/Getty Images

The love story between Christopher and his wife Dana is also shared, along with his first partner, Gae Exton, who is the mother of his two oldest children, Matthew and Alexandra.

When Christopher died in 2004 from cardiac arrest, the Reeve family established a foundation in his name. Two years later, his wife Dana died from lung cancer. William, Alexandra and Matthew now serve on the board of directors for theChristopher & Dana Reeve Foundation, dedicated to research on curing spinal cord injury.

source: people.com