The boy was all smiles when he finally donned his Superman costume. With the help of the stuntmen, he was fitted with a harness and suspended with cables so he could “fly.”
Robert’s photo shoot took place in front of a green screen, with Angel editing the cables out of the pictures and putting him in front of a variety of backgrounds, including flying above the Atlanta skyline.
"I had never seen him this way," Angel told "Inside Edition." "He was so full of energy and happiness. Last time I saw him, he was in a wheelchair."
Video of the photo shoot, which took place Feb. 9 at Southeastern Movie and Stunt House in Atlanta, showed Robert grinning and laughing as the stunt crew hoisted him into the air and helped him into a flying pose. Smiles also lit up the faces of those helping him fulfill his dream.
Scroll to the end of this story to watch video of Robert's photo shoot. Find additional photos from Robert's adventure as Superman at BrandyAngelPhotography.com.
Besides learning to fly like a superhero, Robert also learned some stunt techniques and fought a stuntman wearing a Batman mask. Angel said in a Facebook post that the day was one of the greatest of her life.
Hart said seeing her son’s smile again was amazing.
"They made him feel strong and powerful, and he doesn't feel like that most days," Hart told "Inside Edition."
Hart wrote in her update on Robert's Facebook page, titled Robert the Great, that her son knows more treatment is ahead for him, but is happy and enjoying life each day.
“He is currently enjoying a rare break from pain and discomfort,” Hart wrote. “He looks and feels better than he has in a few years.”
She wrote that she and her husband hope to get their son into another immunotherapy trial. If that trial fails, the next option would be a bone marrow transplant, which isn’t ideal because of severe liver damage caused by years of chemotherapy.
"Our hope will never falter, though now it seems more guarded," Hart wrote. "(Doctors) are now kindly suggesting that we enjoy the time that we have with our son. We no longer talk about statistics or numbers with others. We just keep working the problem the best that we can. We feel as if the cure that we so desperately want for Robert is quickly slipping from our grasp, but we are trying to remain hopeful that we will still win.
“As of right now, Robert feels great and we plan to take advantage of that and enjoy every second of every day. We will never give up.”