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The Challenge: Rivals is the 21st season of the MTV reality game show, The Challenge. Rivals takes place in Costa Rica, Argentina, and Patagonia. The season used former cast members from The Real World and The Challenge. Rivals marked the first season of The Challenge to not include any cast members from cancelled series Road Rules. The season featured an incendiary format in which players were teamed with their arch enemies from past seasons of The Real World and The Challenge. The season premiered on June 22, 2011
Streaming, rent, or buy The Challenge – Season 21:
Currently you are able to watch "The Challenge - Season 21" streaming on Amazon Prime Video, fuboTV, DIRECTV or for free with ads on The Roku Channel. It is also possible to buy "The Challenge - Season 21" as download on Apple iTunes, Google Play Movies, Vudu, Amazon Video, FandangoNOW.