Only six players are left, and the remaining women try to hold their own against the men who are still in the game. In a surprising pop quiz, one player wins a mysterious prize. And at this week's challenge, the players get the chance to sabotage one another by giving each other calories.

Since The Biggest Loser is a global phenomenon, the last five players are surprised with a trip to the other side of the globe Australia! Once there, they get a visit from the Biggest Loser: Australia winner, Adro, compete in a race around the city of Sydney, and climb the legendary Sydney Harbor Bridge. In the end, the final four players are determined by an emotional weigh-in and elimination.

Then they head to the final weigh-in, where two of the final four players fall below the yellow line. But instead of them choosing which of the players will be a finalist for the finale, Sweeney tells them about one last game-changing twist - that for the first time ever in "Biggest Loser" history, America will determine who the third finalist will be. Viewers will vote online at www.nbc.com on the two that fall below the yellow line, with voting taking place for 48 hours following the end of the east coast broadcast at 10 p.m. ET on April 8. Who America chooses to be a finalist - and who they choose to eliminate - will be revealed in the first five minutes of the live finale on April 15.