The Amazing Race Preview for "Don't Ruin the Basketball Game"

The teams continue racing through China.

The pressure builds when a prehistoric Roadblock pushes one Racer over the edge and a Double U-turn causes panic among the teams. Catch The Amazing Race Sunday, March 20 at 8:00 PM, ET/PT

Looks like another wild and crazy episode as the teams all have Unfinished Business.

The Amazing Race Preview for "I Never Looked So Foolish in My hole Entire Life"

Teams dressed as kangaroos continue through Australia where one Racer reverts to old habits as tempers start to flare, and another Team breaks down in tears from utter exhaustion, on THE AMAZING RACE: UNFINISHED BUSINESS

Also a special plea this week from Amazing Race host Phil Keoghan:

“More than that the message that I really want to communicate … is … people need to travel to New Zealand,” Keoghan told Craig Ferguson. ”This is a national emergency. If people stop going to New Zealand — the economy is so small and tourism is so important — if people cancel trips and they don’t travel to New Zealand …”

"The city of Christchurch, which is a small city. The rest of New Zealand is open for business, and we need to communicate that, because in all seriousness, it could absolutely collapse the economy if people just stop coming to the country. … It’s the best thing that people can do.”

This all in response to the terrible earthquake that hit the wonderful country of New Zealand this past week.

Amazing Race 18: Unfinished Business Debuts Tonight

Teams from past seasons return tonight for the 18th installment of The Amazing Race.

This show tests the teams smarts, brawn and ability to get along and is captured in stunning video that will be broadcast for the first time in HD.

This time the show enlists losers from season's past for a second chance at the show's $1 million prize money.

Many fan favorites are back including "cowboys" Jet and Cord McCoy (season 16), sisters LaKisha and Jennifer Hoffman (season 14), Gary Ervin and his daughter Mallory, Miss Kentucky and Miss America runner-up (season 17); erstwhile NFL cheerleaders Jaime Edmondson and Cara Rosenthal (season 14); "goth couple" Kent Kaliber and Vyxsin Fiala (season 12); Margie Adams and her son Luke, who is hearing impaired; and Harlem Globetrotters Nate "Big Easy" Lofton and Herb "Flight Time" Lang (season 12).

The race will last several weeks and take the teams once again around the world.