The longest-running reality competition series MTV's The Challenge will embark on its monumental 40th season beginning Wednesday, August 14 at 8PM ET/PT. The Challenge 40: Battle of the Eras will feature 40 legendary competitors from the series’ 26-year history representing their “Challenge Era” in an epic battle for the ages where legends will collide as they strive to immortalize their names as Challenge 40 Champions and earn their share of the one million dollar prize.