SURPRISE ESCALATOR CHALLENGE CHANGES THE GAME FOREVER -- In this week's episode, one team retaliates after being called lazy by another team, and the willpower of the contestants is put to the test during a soda temptation. Then the game is changed forever - for trainers and contestants - after a dramatic escalator challenge. Alison Sweeney is the host, and Bob Harper and Jillian Michaels also star.