To get past the bullies at school, Daniel Keyte tells them he has a special reactor in his chest, just like comic book hero turned movie star, Iron Man.

In reality, they are tubes for his cystic fibrosis treatments, attached to his chest and side.

His mother, Vicky Keyte, posted a picture to Instagram of Daniel showing his version of an ‘arc reactor' and asking actor Robert Downey Jr, who plays Iron Man, to drop a friendly comment of encouragement.

Downey sprang into action — in a tiger suit instead of his usual Iron Man armor. He posted the picture to his Instagram account where he told Daniel he wears it to cheer himself up when he's feeling down. Then, he invited the little boy to be a guest at the Hollywood premiere of "Captain America: Civil War."

Mr. Stark here. This is for Daniel (@envy_coatings) who was having a rough day recently. When I’m in the dumps, I’ve found this little getup to be helpful. P.S. Would you like to come to the LA premiere of Captain America: Civil War as my guest? If so, have your people call my people. All the best.

A photo posted by Robert Downey Jr. (@robertdowneyjr) on Oct 23, 2015 at 6:05pm PDT

Mr. Stark here. This is for Daniel (@envy_coatings) who was having a rough day recently. When I'm in the dumps, I've found this little getup to be helpful. P.S. Would you like to come to the LA premiere of Captain America: Civil War as my guest? If so, have your people call my people. All the best.

A photo posted by Robert Downey Jr. (@robertdowneyjr) on Oct 23, 2015 at 6:05pm PDT

Keyte couldn't believe it when she saw Downey's response.

"I was a blubbering wreck," she wrote.

She promises to keep people updated as they prepare for the big night — right down to Daniel's tuxedo fitting for the walk down the red carpet. Photo credit: Robert Downey Jr. via Instagram