Back in 2016, Jackson Tijerina was diagnosed with brain cancer, and since then has been going through intense Chemotherapy. Jackson is a huge fan of Iron Man, his favorite superhero, even having his own medical piece in his chest like his hero.

Jackson's mother, Amy, has put together a special bucket list of things Jackson would like to do to make sure this experience doesn't take away his smile and meeting "the real Iron Man — Tony Stark" was the number one item on the list.

So she reached out to the world of Facebook and eventually Iron Man himself responded, sending out a personal message to Jackson that according to his mom, "he's been watching on repeat".

Watch Robert Downey Jr.'s words to Jackson, below.