Earlier the week, the story of a little six-year-old boy went viral after it was revealed that he had put his life on the line in order to save his young sister from a dog attack.
Sharing young his story on Instagram, Bridger Walker's auntie, Nicole, wrote: "Hey, all. Please, share my nephew’s story so that it gets as much exposure as it can. We know that our little hero would love some words of encouragement from his favorite heroes.
"On July 9th, my six-year-old nephew Bridger saved his little sister’s life by standing between her and a charging dog. After getting bit several times on the face and head, he grabbed his sister’s hand and ran with her to keep her safe.
"He later said, 'If someone had to die, I thought it should be me.' After receiving 90 stitches (give or take) from a skilled plastic surgeon, he’s finally resting at home. We love our brave boy and want all the other superheroes to know about this latest hero who joined their ranks."
The youngster was left with injuries nobody - especially a child - should have to live with, but seeing as Bridger is a huge Avengers fan, his auntie campaigned to get the Marvel stars to send her nephew some words of encouragement.
The young superhero-in-training has already received messages from Avengers stars Mark Ruffalo, Chris Evans (who is sending the six-year-old his own Captain America shield), Tom Holland, and Chris Hemsworth.
Now, Iron Man star Robert Downey Jr. has sent Bridger a message of his own, which was later shared by his auntie on Instagram.
In the touching message, Downey says: "Bridger, you're a rockstar. My name's Robert Downey Jr., I play Tony [Stark], that makes me an old friend of Cap's. I heard he sent a shield your way: I'm going to do one better.
"You call me on your next birthday, I got something special for you. Late - By the way, that's a promise; a promise beats a shield."
I can't even imagine what billionaire, playboy, genius, philanthropist Tony Stark has up his sleeve for young Bridger.
However, Nicole did mention in the video caption that "we just celebrated Bridger’s birthday not too long ago, so it will be a while before we find out what the surprise is."
I'm sure it'll be worth the wait.
And let's take a look at what the other Avengers have had to say about Bridger's bravery.
Thor star Chris Hemsworth shared a video with his fans telling them all about Bridger's heroism, praising the six-year-old as "an absolute inspiration".
Hemsworth added: "Your courage is beyond belief and we are all so impressed by you, and we're thinking of you.
"I know you're an Avengers fan and so myself and all the team, we'd be honored to have you on the team, and we love you and we're sending you our support."
Bridger also received a video call from Tom Holland who plays Spider-Man in the MCU. The call took place on Thursday (July 16), and Holland can be heard telling Bridger: "You are so brave, mate, and we are all so proud of you and your little sister is so lucky to have you."
Holland then asks Bridger - who is wearing his best Spider-Man costume - what movie he was watching, to which the youngster replies: "Spider-Man: Homecoming."
This causes Holland to joke: "You’re even more of a hero now!"
Holland then invites Bridger to visit the set of the third installment of this Spider-Man series, telling the six-year-old: "You’ll always be my guest."
Chris Evans - aka Steve Rogers/Captain America - also sent a heartwarming video message to the young boy.
In the video, the 39-year-old actor says: "This is a message for Bridger. Hey Bridger, Captain America here, how you doing buddy? So, I read your story and saw what you did. I’m sure you’ve heard a lot of this over the last couple of days, but pal, you’re a hero.
"What you did was so brave and so selfless, your sister is so lucky to have you as a big brother. Your parents must be so proud of you. I’m going to track down your address and send you an authentic Captain America shield because, pal, you deserve it."
The Avengers star added: "Keep being the man you are, we need people like you. Hang in there, I know recovery might be tough, but based on what I’ve seen, I don’t think there is much that can slow you down. Bye buddy."
But the first Avenger to send his support to Bridger was Mark Ruffalo, who plays The Incredible Hulk in the MCU (except that one movie that we don't talk about.)

Commenting on Nicole's original post, Ruffalo wrote: "Dear Bridger, I just read about what happened to you and I wanted to reach out to say this… People who put the well beings of others in front of themselves are the most heroic and thoughtful people I know.
"I truly respect and admire your courage and your heart. Real courage isn't dominating people or fighting against people or walking around like a tough guy. Real courage is knowing what is right to do and doing it even when it might end up hurting you somehow."
"You are more of man than many, many I have seen or known. With Admiration… Mark Ruffalo (Bruce Banner/Hulk/Professor)."
That's right, this kid is literally friends with FIVE Avengers!