Dr. Phillip Thrush promised Austin - a die-hard Star Wars fan from Pontiac, Illinois - that when a heart became available, he would deliver the good news wearing a Chewbacca costume.
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Dr. Thrush made good on his promise Saturday, speaking fluent Wookie. The heartwarming moment was captured on video in Austin's room at Lurie Children's Hospital in Chicago.
RAW VIDEO: Chewbacca tells boy he's getting a new heart
Heart transplant recipient's mom speaks
"We got a heart? Do we seriously have a heart?" Austin asked before high-fiving and hugging the pediatric cardiologist-turned-Wookie warrior.
"To see him knowing that he has a chance at life, that he has a chance to achieve so many things leaves you speechless," said Austin's mom, Mary Anglin, of that blissful moment Saturday morning, which has more than 70,000 views on Facebook.
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Anglin also expressed gratitude for the donor's family, which had to make a courageous decision to donate a child's heart in their time of grief.
"He will make sure that he does remarkable things because of it," Anglin promised.
First up: lobbying Marvel to host a special screening of Avengers: Infinity War for the Lurie's kids who cannot leave the hospital because of their illnesses.
He's started a social media campaign using the Twitter handle @TheReelThanos, hoping to get the movie maker's attention.
Marvel and ABC11 are both owned by the Walt Disney Company.