It's Diem's birthday and the cast celebrates by having another mission - this time involving greased-up poles and slip 'n' slides across the beaches.

After a hard night of drinking, Robin decides to question everything about Aneesa's identity, including her race and sexual orientation.

The final four meet for their last mission - and the largest cash prize in Challenge history.

The next event (a female Duel Day), places the 19 remaining in a waist-deep mud pit, swimming and wading through murky water in the Ring Toss event.

Evan becomes paranoid that he's the one who will be sent into the Duel.

The 'Paddle Me' challenge puts the final six's swimming skills to the test when they're told the male and female winners alone will be safe from The Duel and automatically going into the finals.

Romantic sparks fly between CT and Diem (who continues to be supported by the Drama Mafia).

The once symbiotic alliance between Beth and Svetlana is severed when Brad accuses them both of being back-stabbers and pot-stirrers.

Tensions run high as the guys face their second to last Duel challenge, and the surprising alliance of Evan and Wes comes to the surface. Part 1 of 2

Tensions run high as the guys face their second to last Duel challenge, and the surprising alliance of Evan and Wes comes to the surface. Part 2 of 2.

Watch your favorite Duel players for a reunion full of unseen hookups and fights uncut. Beth and Svetlana get heated, Tina steps in to give her story, and much more.

Aneesa feels the pain when she realizes that she cannot trust anyone in this game.

In another amazingly physical challenge, the guys face against the guys, and the girls face off against one another in Push Over", where the last man standing wins safety.

As we whittle down to the final five girls, the stakes get higher as CT and Diem continue their love fest, and the girls realize that Jodi is their strongest competitor.

Beth and Tina face-off, and after having thrown a punch that cut Beth, Tina is sent packing.

This season, 10 men and 10 women make the trek for Brazil for Real World/Road Rules Challenge: The Duel". Their goal: fight to win not only the grand prize, but the respect that goes hand-in-hand with the title of "Challenge" winner.

As we get down to the final five guys, Brad and Eric discuss strategy while Evan and Wes hope to get Eric to take CT out of the competition.