Former World Wrestling Entertainment (WWE) superstar CM Punk will be coming to Ultimate Fighting Championship (UFC) at the upcoming UFC 203 pay-per-view (PPV) event, locked and loaded for Quicken Loans Arena in Cleveland, Ohio, on Sept. 10, 2016.

It's kind of a big deal.

So much so, that UFC has been filming a documentary that chronicles Punk's transition from the wrestling ring to the mixed martial arts (MMA) cage. That includes his preparation and training for opponent Mickey Gall, who made his UFC debut earlier this year.

Take a look.

Punk's debut has been mired with injuries, setbacks, and various delays, so hopefully we can make it these last few weeks without incident. To see who else is fighting at UFC 203 next month in Cleveland check out the current fight card and rumors right here.