IndyCar stars Alexander Rossi and James Hinchcliffe will race a Walkinshaw Andretti United Holden at the 2019 Bathurst 1000.
The pair will spearhead a WAU wildcard entry, which will be staffed by not just the Supercars team, but Andretti Autosport and United Autosports as well.
The one-off entry will be backed by William Sandbrook and Virgin Australia, with the car set to run the famous Andretti #27 that Rossi uses in IndyCar.
It will run alongside WAU's two regular entries, which will be raced by James Courtney/Jack Perkins and Scott Pye/Warren Luff.
Bathurst will be Rossi's Supercars debut, with his previous non-single-seater experience centred around sportscar outings at Le Mans, Daytona and Sebring.
Hinchcliffe has some Supercars experience, having raced for Garry Rogers Motorsport at the 2012 Gold Coast 600.
"As drivers we look back at the era of guys like Mario [Andretti] jumping in a different car every weekend, the nature of the sport now is quite different and it's not quite as easy to do that," said Hinchcliffe.
"When these opportunities come up you want to jump at them and really grab a hold of them.
"The Gold Coast race some years ago was a huge blast and a bucket list thing, but for Supercars the Bathurst 1000 is their Indy 500, it is their 24 Hours of Le Mans, it's their hallmark event. So to get to add that one to the resume is very special."
Rossi added: "It's 100% a bucket list item. It's in one of those six big races alongside the likes of the Indy 500 and 24 Hours of Le Mans.
"Bathurst is right up there, so to be able to have this opportunity to do it with Walkinshaw Andretti United and still be close to home with the Andretti Autosport connection is very cool and I can't wait to get started.
"It's going to be a steep learning curve and I'm very aware of that.
"I've got a few friends who are Supercars drivers, so I know how talented the competition is, and how challenging this specific racetrack is.
"But at the same time it's a really exciting challenge and something that has been on my target list for a long time, we're going to go out and do the best we can."
The pair will test the ZB Commodore at Winton on October 1-3 in preparation for the race a week later.