Following the hugely successful boom of reality television in the new millennium, producers decided to add new elements to the series.

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This season, the first to depart from the previous six-member structure, brought in a large group of former cast members to compete in one location.

Beginning with the first Battle of the Seasons, MTV added a fantasy challenge game to their website.

The criteria that teams have been arranged by over the show's history have ranged all across the board, from gender of the contestants and original show of contestants to bad guy/good guy status of contestants and ex-romantic partners of contestants.

Each of the opposing teams compete in numerous missions in order to win prizes and advance in the overall game.

In 2005, Bunim-Murray Productions decided to invite new people to the Challenges who were never a part of either Real World or Road Rules and called them 'Fresh Meat.' This decision was forced, in part, because of the status of Road Rules at the time.

While Road Rules had stopped production until further notice after its thirteenth season, Real World had just finished wrapping its sixteenth season in Austin, Texas.

The most recent season, Vendettas, premiered on January 2, 2018.

The Challenge casts are season specific as the cast varies from season to season.

, Big Brother (US), Ex on the Beach (UK and US), and Geordie Shore competing against one another for a cash prize. Later on, however, the series began using hosts: Eric Nies and Mark Long co-hosted a season, and Jonny Moseley and Dave Mirra hosted various seasons before T. Lavin became the show's regular host by the 11th season.