Last Tango in Buenos Aires

'''The four remaining teams head for Argentina to partake in a challenge filled with tango and rodeo. One team continues their nefarious ways in messing with another team in order to continue their winning ways, while one's continued attempt to be less aggressive is furthered along with another's encouragement. After going through too many trials of their own, someone finally confesses their love for another, but the final race to the finish leads to a problem caused by another to throw them off a mountain; forcing new lovers out of the race but bringing back two others in their place.'''

Plot
The final four receive their tips and head for their next destination: Buenos Aires, Argentina. Devin is convinced that nothing will go wrong, causing Carrie to worry that he may have jinxed them. At the airport, Kitty manages to convince the ticket holder to book the Ice Dancers and the Cadets in the seats next to the restrooms, and the two teams swear revenge on the Sisters later on for doing so. Devin, once again, tries to confess to Carrie about his feelings, only to chicken once again.

Once in Buenos Aries, the teams face an All-In where they must perform the tango at a local dance academy to receive their tip before taking a cab to a ranch. The Ice Dancers easily complete the challenge due to being dancers and take the lead. The Police Cadets are too aggressive with their dance and fail. Devin has taken tango lessons with Shelley, and is confident he will be able to profess his love for Carrie, but ends up injuring her during their dance. The Sisters are the second team to finish and head for the Don Box.

The next challenge is a Botch or Watch where one team member must ride a horse and use a boleadora to tie up their team’s emu and take it to the Chill Zone on Mt. Aconcagua. Jacques tries to sabotage the Sisters by coating their emu with vegetable oil, but ends up spilling some of it on himself. Meanwhile, back at the academy, the Cadets finish their tango, leaving the Best Friends to fall behind. Carrie becomes upset at Devin for repeatedly injuring her and takes charge, allowing them to complete the dance. At the ranch, both Kitty and Jacques struggle during the challenge due to the oil. MacArthur’s horse refuses to move after she keeps yelling at it. Sanders comes over and calmly soothes it, putting the cadets in the challenge.

Kitty becomes frustrated after her boldeadora keeps slipping off and tackles the emu, sending both of them down the mountain (though she snaps a selfie), followed by Emma, who was concerned about her sister. Jacques gets the oil off his hands by rubbing it in his hair, allowing him to tie his emu. MacArthur manages to capture her emu next, and the two teams race for the Chill Zone. In a close footrace, the Ice Dancers manage to beat out the Cadets for first, much to Don’s amazement.

The Best Friends are the last at the ranch. Devin manages to snag his emu, but notices they are the only ones there. Carrie gives up hope, and Devin finally tells Carrie that he’s in love with her. The two embrace and have their first kiss, before noticing the Sisters heading up the mountain. Realizing they are still in the race, they head for the Chill Zone. In order to catch up with them, Kitty ties herself to the emu. In another close footrace to the Chill Zone, the Best Friends barely manage to beat the Sisters and take third. However, Kitty, unable to steer the emu, crashes into Devin, sending him over the cliff’s edge. Kitty is wracked with guilt, but Emma assures her it was a non-elimination round, meaning the Sisters are still in the Race.

Devin is too injured to continue with the race and is evacuated by helicopter in a body cast. Before the Best Friends depart, Don tells them they must choose one team to return to the competition. Carrie chooses the Surfer Dudes, as they sacrificed themselves for them back in Vietnam. The producers call Brody and Geoff, who are hanging at the beach, having them come back to the show.

As the Best Friends leave via helicopter, Carrie reminisces over the good times they had during the race and professes her love for Devin. However, she hears a muffled Devin say “Shelley” and tells him to stop talking.

Cast

 * Brody and Geoff appear; however, they have no dialogue.
 * The paramedic who takes Devin away speaks; however, it's unknown who voiced him.

General

 * Those who compete in the Botch or Watch are Jacques, Kitty, MacArthur, and Devin.
 * This episode was supposed to be a non-elimination leg, but since Devin sustained major injuries, he and Carrie were removed from the race.
 * As of this episode, every team from the original final five was saved by a non-elimination round at least once.
 * Even if the Sisters had reached the Chill Zone before the Best Friends, they would have been penalized as Emma helped Kitty in the Botch or Watch.
 * Interestingly, The Ice Dancers did not get penalized, although Jacques didn't catch the emu while riding the horse.

Continuity

 * The Rob Ford look-alike from None Down, Eighteen to Go - Part 1 appears as a passenger walking out of the lavatory.
 * When Don requests the Best Friends to choose one team to bring back, they pick the Surfer Dudes to repay them for sacrificing themselves to let them stay in the game in Ca-Noodling.

Goofs

 * The cast on Sanders's left arm disappears several times in the episode.
 * The Argentinian birds are incorrectly referred to as emus. They are actually called rheas, which are closely related, but still distinct from emus which are native to Australia.
 * In several instances of the episode Buenos Aires is shown to be situated by the Andes. In reality, the city is located in a geographic area known as the Pampas.
 * When the helicopter is flying away, only Josee's hair is seen blowing, while the other contestants' hair remains still.