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The Rock is the voice actor for character Maui in the movie, in which he plays a Polynesian god - who happens to be a particular favourite of 3-year-old Hyrum.
He posted the video on Instagram with the caption: "This request came across my desk and punched me in the gut a bit.
"There's a little 3-year-old boy out there named Hyrum. Diagnosed with acute lymphoblastic leukemia which is complicated by Down Syndrome. In the fight of his life right now and doing his best to stay strong - by watching MOANA up to 10xs a day because the character he loves, MAUI makes him feel strong.
"According to Hyrum's mama, his most important thing to say now is, I STRONG. Yes you are big man. Yes you are. Hyrum, I know I'm a complete stranger to you - who sounds a lot like your hero, MAUI (only with a very large head), but myself along with millions of other strangers who will watch this video are sending you so much love, strength and mana your way.
"I STRONG. Love, the Rock aka the dude who sounds a lot like Maui."
Johnson's friend, Ryan Reynolds commented on the video, saying: "This is the good work, D."
The love for little Hyrum poured in on The Rock's comments and the boy's mum posted a touching response to Dwayne's video on Facebook, which he also shared.
He wrote the caption: "Update from the video I posted. Look at this lil' boy, Hyrum's face. That's some joy real right there. Thank you to the person who wrote this beautiful note.
"You're absolutely right - joy and hope cost nothing and yet, is the most powerful gift we can give. That's the real magic to life."
The boy's mum is 'blown away' by the support from Dwayne and all his fans, saying it's helped Hyrum in what is the 'fight of his life'.
She wrote on Facebook: "He's watched Moana over and over. It's what he does on his hardest days. He watched the video from Dwayne again... while watching Moana.
"I love when he smiles. Points to his chest and repeats his name. It reminds me that cancer is not taking our boy, just his energy."
A GoFundMe page has been set up to help Hyrum's family with the financial strain of his illness, which has meant he spends long stretches of time in hospital - you can find it here.
Featured Image Credit: Disney
Topics: Daily Ladness
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