The teams race through Las Vegas, where they face a final challenge designed by magician David Copperfield.

The final four teams have a once-in-a-lifetime experience in Liverpool, England; a misinterpretation puts one team in jeopardy.

A double U-turn in Spain threatens the alliance; one team's future is threatened by a possibly game-changing injury.

Tension rises as the finish line gets closer; three teams form an alliance.

Six teams encounter a double U-turn; one team considers a major decision.

The racers square off with Roman gladiators in a medieval detour; three teams make a deal in hope of avoiding elimination.

The teams are in Sri Lanka, where an exhausting Roadblock drains the racers of all their strength. Also, an epic race through the countryside ends with a footrace to the Pit Stop.

Teams face struggles as they go fishing for their next clue in Sri Lanka.

The race continues in Kuala Lumpur, Malaysia. A racer pours blood and tears into a roadblock; a particularly difficult detour makes a racer melt down.

The race continues in Kota Kinabalu, Malaysia. The teams face rapids in the Malaysian jungle on homemade rafts; a team fights to stay in the running after taxi trouble.

Mallory and Mark struggle with communication and a major mistake puts them in jeopardy.

Eleven all-star teams compete for a chance to win the $1 million top prize as the 24th season begins. However, in a dramatic twist, one duo won't make it to the starting line. The other pairs jet off to Guangzhou, China.