The battle of the sexes continues as the 12 remaining contestants must overcome injuries and trainer disputes. Another food temptation tests their resolve; they have to decide if they want "the gravy train" or the next physical challenge, which requires the teams to travel up and down the aisle of a moving railroad train.

The teams hit the road for the ultimate temptation town: Las Vegas, where the trainers teach skills for a hotel stay ranging from eating right when confronted with a buffet, to finding ways to workout within their hotel rooms. A card game that offers the chance to win up to $5,000 comes with high stakes - losing their trainer for the rest of the week. The team challenge for the opportunity to choose who sits out at the next weigh-in and to win a return trip to Vegas with their families consists of a relay race in the hotel swimming pool.

A team's spirit drops as its number dwindles, and their trainer hopes a pep talk from a surprise visitor from the past can make a change. However, even the effect of the visit on the team can't prevent a storm of personality clashes, which boosts the confidence of the opposing side.