The G League star -- who wowed the entire basketball world with his top performance in 2023 -- peeled back the curtain on this year's contest ... and it sounds like fans can expect nothing short of fireworks.

"I think I have three dunks that haven't been done in a contest before, but I think two of them haven't been done by anybody before," McClung said. "So I hope I can make them -- if I make them, I'll be happy and I do them right."

"But we put a lot of effort into it and hope it goes well."

Mac -- who currently plays for the Osceola Magic -- says there are about six different dunks he's got ready to go ... and the only real issue is figuring out which ones he'll pick.

But it's not just the dunks that have him excited -- he hinted there could be some cameo appearances featured in his routine as well.

McClung is going up against some fellow high-flying athletes -- Jaylen Brown, Jaime Jaquez and Jacob Toppin -- and he admitted he'll be just like the fans as he watches them perform.

There will be a lot more than a shiny trophy on the line for McClung -- the hooper recently partnered with hi-tech insoles company, VKTRY ... and if he repeats as champion, he's giving out $ 500k worth of product to a number of lucky fans who register for the giveaway.

McClung raved about the insoles ... claiming they give him a big advantage on the court.

Dude better be careful, or he's gonna need a helmet when his head hits the roof.