Contestants from reality shows "The Amazing Race," "Big Brother" and "Survivor" compete.

Racers have a big decision to make when they face a surprise double U-turn in Laos.

Enemies are made when one team steals another team's taxi in Ho Chi Minh, Vietnam.

Teams take a leap of faith when choosing which detour challenge to take; a split-second decision may make or break one team's chances.

Teams must drum up enough strength for an intense head-to-head battle before checking into the mat.

Teams travel to Switzerland where they free-fall over 400 feet into the Gletscherschlucht Glacier Gorge.

While in Switzerland , teams are surprised by the first ever public U-turn vote, where racers have to vote in front of each other.

Teams take a bumpy ride in Split, Croatia, and try not to get tongue twisted reciting poetry while in motion.

The final five teams must transport eggs by bicycle in the Netherlands.

With $1 million on the line, the final four teams race through London and Detroit on the quest to cross the final finish line first.