CBS has announced that the twelve teams of "The Amazing Race 4" will start their race of a lifetime quest for $1 million with a special 90 minute episode of "The Amazing Race 4," airing on Thursday, May 29th (8:00-9:30 PM, ET/PT) on the CBS Television Network. Phil Keoghan once again returns as host of the series.

The 12 new teams include circus clowns, a set of moms whose husbands play for the NFL Atlanta Falcons, a couple who have been dating for 12 years and are still virgins, and a pair of models from Miami.

In the premiere episode, the teams set off on the first leg of the race starting at Dodgers Stadium in Los Angeles before quickly making their way to Milan, Italy. Several teams form alliances with each other, causing tensions to rise, while another team almost misses their opportunity for a night’s sleep. Some teams embrace the thrill of zip gliding, while two other teams question if they can keep up physically with the race. Several twists occur as teams confront major obstacles on the way to the pit stop.

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