Piloting helicopters with the Royal Air Force search and rescue team has been one of the big highlights in Prince William's life.
"There's no greater feeling than when you've actually done some good and saved someone's life," says the 30-year-old Duke of Cambridge in the upcoming BBC One Wales series Helicopter Rescue.
"I don't think there's any greater calling in life…to be able to see a son or daughter's face when you bring their mother or father back from the edge of death—it's quite powerful."
It's a feeling that several of Hollywood's biggest stars like Jennifer Lawrence, Ryan Gosling and Gerard Butler have experienced, too. Click through the gallery to see how they and others big names have performed the ultimate good deed and saved a life.
How do you think you would you react if a celebrity came to your rescue? Tell us in the comments or on Twitter @OKMagazine
Prince William once flew his Royal Air Force helicopter through heavy fog to scoop to safety the victim of a heart attack who had tumbled down Mount Snowdon in Wales.
Ryan Gosling saved an English writer from getting run over when she looked the wrong way and stepped into the path of an oncoming cab. "It was a little bit like being in a cheesy film, but every day in New York is like being in a cheesy film," says Laurie Penny.
Party foul! Last summer Jennifer Lawrence helped a girl who L.A. sheriffs say appeared to have drank too much and passed out in the grass. The Oscar winner waited with the female until help could arrive.
No mission is, well, impossible for Tom Cruise. The actor has saved lives several times, including rescuing a group from a burning boat. He also helped a woman named Heloisa Vinhas after she was hit by a driver who fled the scene. "If he's not Superman, he can be Batman—Batman doesn't have super powers," said Heloisa.
Gerard Butler jumped into Scotland's River Tay to pull a drowning boy to safety in 1997, and the Royal Humane Society awarded the actor with a Certificate of Bravery for his daring deed. “I didn’t feel like a hero at all," he says.
Tom Hanks was reportedly jogging near his Malibu, California, home when he heard a drowning man crying for help after he got swept away in a riptide. The actor yelled instructions on how to escape the strong current and then dragged him to safety.
While out hiking in L.A.'s Runyon Canyon, Renée Zellweger saved a woman who had collapsed and slid down the hillside. The actress risked her own well-being to reach the woman and wait with her for help.
Indiana Jones would be proud. Harrison Ford used his helicopter to rescue a dehydrated hiker who got stranded on top of Table Mountain in Idaho. "I can't believe I barfed in Harrison Ford's helicopter," she later said of the 2000 rescue mission.