Eighth installment of this reality series in which teams perform various tasks on a trip around the world in 30-40 days. The twist for this installment is that the teams are comprised of four family members. At every destination, the couples compete in a series of challenges, some mental, some physical, and only when the tasks have been completed do they learn of their next destination. Couples who are the farthest behind are gradually eliminated, with the first team to reach the final destination receiving $1 million.