This week, one eliminated contestant returns and the remaining players are split into four teams - red, blue, green and black. Each team will be led by one of the four trainers - Bob Harper, Jillian Michaels, Cara Catronuova and Brett Hoebel. While Bob takes his team to spin class and Jillian takes hers to work out at the beach, Brett leads his group on a hike and Cara heads to a boxing ring and has one of her players fight against a longtime boxer. Later, the four teams square off in a difficult challenge involving ropes and weights, and then gameplay at the weigh-in doesn't turn out the way one contestant expects, and another player is sent home. Alison Sweeney hosts the series.