The Challenge: Rivals

Rivals
Season 21
Presented by	T. J. Lavin
No. of contestants	29
Winners	Johnny Devenanzio Tyler Duckworth Evelyn Smith Paula Meronek
Location	Dominical, Costa Rica Buenos Aires & Bariloche, Argentina
No. of episodes	12 (Special & Reunion Included)
Release
Original network	MTV
Original release	June 22 (2011-06-22) – September 7, 2011 (2011-09-07)
Season chronology
← Previous Cutthroat Next → Battle of the Exes

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 not to include any cast members from Road Rules.

The season featured a 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, and concluded with the "S#!% They Should Have Shown" special on September 7, 2011.^[1]

This is the first edition of the Rivals series, with Rivals II and Rivals III following in 2013 and 2016, respectively.