Past feuds and grudges comes back to haunt 28 eager Challenge competitors, all vying for their share of $500,000. Romance is in the air at the Challenge house, but so is revenge, as the players plot their next moves.
A mysterious player leaves mean notes in the girls' room, causing havoc with their game as they all try to figure out the culprit. The bromance between Victor and Shane fractures into a newfound vendetta.
While Challenge couple Brad and Britni plan on winning the game, players begin to plot their demise behind their backs. A player is caught stealing and generates a new vendetta.
When one of the players falls ill, their true strength in the game is tested. Kayleigh is fed up with her vendetta Melissa, whose antics culminate in an explosive fight that rocks the Challenge house.
When the mysterious and offensive notes continue to circulate the Challenge house, it causes a stir amongst the female competitors and the culprit is finally revealed. When four Challenge legends return, the game is turned upside down.
