Survivor : Heroes vs. Villains

Unlike previous seasons where a break in production occurred between seasons, the twentieth season was shot twenty days after Survivor: Samoa was completed, taking advantage of the existing infrastructure from that season. Casting for Heroes vs. Villains was done simultaneously with casting for Survivor: Samoa. Heroes vs. Villains features ten former Survivors known for their acts of integrity and honor, the Heroes, and ten former Survivors known for their deeds of deception and duplicity, the Villains. The cast was officially announced during the 36th People's Choice Awards on January 6, 2010. Jeff Probst, the show's host, stated that while they wanted to do another season where they brought back former players for the show's 10-year anniversary and 20th cycle, they did not want to simply do another All-Stars season. On reflecting on the most popular players, they realized that these players were either seen as likable or despised for those respective seasons, and opted to use that as the theme for this season.

Source: Wikipedia.org