Though tensions between two teams on The Amazing Race: All-Stars had appeared to cool down as they competed for places in the final three, any tentative calm is officially gone now that the finish line is in sight.

Brenchel NOT Winning 'Amazing Race:All-Stars?'

In an exclusive sneak peek posted by CBS for the May 18 season finale episode, where Big Brother Newlyweds Rachel Reilly and Brendon Villegas, Country Singers Caroline Cutbirth and Jennifer Wayne and Father/Son Cancer Survivors Dave and Connor O'Leary will all race to cross the finish line first and officially be declared winners of The Amazing Race, the tensions between 'Brenchel' and the other two teams will show once more as the teams first arrive in Las Vegas.

The clip begins with the teams being driven into the desert just outside of Las Vegas by men who look like they're in the Mafia. They suddenly pull off to the side in the sand and are ordered to get out of their cars and begin digging.

Connor's Life At Risk In 'Amazing Race' Season Finale?

After dirt from Rachel's shovel hits Connor, he turns around and asks her to stop throwing her dirt at him, unleashing a nasty battle between the teams.

"Hey, will you not throw dirt on me?" Connor asks her as his father tells her and Brendon to not throw dirt on them.

The issue appears to be dropped until the Brenchels begin throwing their dirt back at the father/son team again, letting it land in the hole they've already dug.

"Hey, guys, stop throwing stuff in our hole!" Connor pipes up again.

"Shut up, we're not," Rachel replies.

"Shut up, you are!" Connor yells back as Dave and Brendon get into the shouting match as well.

This causes the Country singers to get involved as well, as they are aligned with Dave and Connor.

"Rachel, you shouldn't play nasty,: Caroline says.

Brendon then turns his attention on the Country Singers and insults their ability to race.

"Girls, don't be pissed because you can't run as fast as her," he says.

Finally, as all the teams find boxes directing them to return the contents to David Copperfield and get back into their cars, Brenchel admits that they are playing dirty, and would continue to do so.

"The reason I told him to shut up is because he's so stupid," Rachel says. "Like, it's the final three of Amazing Race, what do you want us to do? Be polite, and be like 'Oh, fine, why don't you find the clue first Dave and Connor?' If I could, I would go back and put more dirt in their hole."

The Amazing Race season finale airs Sunday, May 18 at 8 p.m. on CBS.


Tags: The Amazing Race CBS Reality TV