Each year, Ryan Miller transforms his son's wheelchair into something super cool for Halloween.

When he was a toddler, Jeremy Miller (now 8) needed hip surgery due to spina bifida, a birth condition that occurs when the spinal cord fails to develop properly. The operation left him in a "hip spica," which immobilized both of his legs, according to Today.

Ryan said that they asked Jeremy's doctors to make the apparatus red so that he could be Lightning McQueen. The following year, Jeremy used a walker to help him get around. Ryan decided it would be cool to transform the walking apparatus into the Batmobile.

TenaciousJeremy/Instagram

People who knew the family loved the different ideas and wanted to know what Ryan would come up with next.

"They'd say, 'What are you going to do next year?' And from that, it got a little bit bigger and a little bit bigger, and now it's kind of crazy," he explained.

Last year, Ryan made Jeremy's wheelchair into a "Star Wars" snow speeder. This year? A "Ghostbusters" car.

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Ryan says that his ideas started off fairly simple, but his executions have most certainly evolved, especially when it came to this year's super cool project.

"In the past, we kind of stuck with PVCs and zip ties, and either cardboard or foam board. But this one had a lot more going on. I spent a lot of time looking on YouTube for different tutorials, but it's been fun," he explained.

TenaciousJeremy/Instagram

Ryan said part of the reason he does this for his son is to make him feel included.

"When he's out at school and things like that, he has his friends, but sometimes they run and they just leave him behind. Part of the reason we do this is because people come to him, so he's the center of attention, and he loves it," Ryan explained.

"It's just part of the parlance of what people say, that he's 'confined to a wheelchair,' or 'wheelchair-bound,' but really, his wheelchair is what gives him freedom, what gives him the ability to do much more than he would otherwise. He's a great kid and he's able to do so many things that just astound us. This is just another way to help him feel special and help him realize that even though he can't do some things, he can do a lot of other things that are great," Ryan added.

TenaciousJeremy/Instagram