• Air date: 22 Jun '11 12 episodes
      Each Challenge pits numerous cast members from past seasons of reality shows against each other, dividing them into two separate teams according to different criteria, such as gender, which show they first appeared on, whether or not they're veterans or rookies on the show, etc. The two teams compete in numerous missions in order to win prizes and advance in the overall game.
  • List of Episodes (12)
    • 1. Welcome to the Jungle

      22 Jun '11
      Twenty-eight Challenge competitors arrive in Costa Rica only to find out that they will be teamed up with their biggest rivals. And a fight on night two sends one Challenger home early.
    • 2. Through The Looking Glass

      29 Jun '11
      On the first men's elimination day, the competition is crushing, and everyone is surprised at who ends up fighting for their lives in the Jungle. Jonna and Camilla have it out, but it's Jasmine who takes the fight to the next level.
    • 3. Underdog Day Afternoon

      06 Jul '11
      A strong team struggles on the girls' elimination day.
    • 4. D-DAY

      13 Jul '11
      The guys plot to send CT home, while Laurel and Mandi vie for his attention. Also: Kenny worries that he's lost his competitive edge.
    • 5. Ill Communication

      20 Jul '11
      Things get heated between teammates Jasmine and Jonna, and a blowout between the girls changes the game. Meanwhile, Adam pursues Jenn.
    • 6. Blow Up

      27 Jul '11
      Evan considers throwing a challenge as part of the guys' plan to get rid of CT. Meanwhile, CT finds himself in the middle of a love triangle with Mandi and Laurel.
    • 7. Blood on the Dance Floor

      03 Aug '11
      One alliance begins to crumble after a brawl between Jenn and Cara Maria. Later, a surprise twist changes the game.
    • 8. Cry for Me, Argentina

      10 Aug '11
      Some players crack under pressure as the final challenge approaches; Laurel defends Cara Maria after Wes and Paula drive her to tears.
    • 9. The Storm Before the Storm

      17 Aug '11
      Two strong male teams fight tooth and nail in "T-Bone," the last elimination of the season. A clue sends the remaining twelve Challengers off to another destination, where they begin the toughest Final in Challenge history.
    • 10. At the End of the World

      24 Aug '11
      With the Final underway, teams thrive or fail based on their ability to work together. One male team and one female team will claim the title of Challenge champions.
    • 11. Reunion

      31 Aug '11
      The "Rivals" cast reunites and dishes about what went down on the 21st season.
    • 12. The S#!@ They Should Have Shown

      07 Sep '11
      Outtakes and previously unseen footage for the 21st season.