The seven remaining teams roll into Flagstaff, Ariz., determined to get the hang of the food truck game. Just when things start to settle down, Tyler springs a Truck Stop cooking challenge on them: Create a dish featuring the local delicacy prickly pear cactus. Celebrity Chef Beau MacMillan judges the dishes and delivers a game-changing prize -- but Tyler is not done. On Sunday, he tells the teams to go vegan, and the teams scramble again to stay above water.

The five remaining teams roll into Fayetteville, Ark., a college town bustling with teenagers. Their Truck Stop Challenge is targeted at this audience as they must create an amazing breakfast dish using Kellogg's Pop Tarts. One of the nation's top teen chefs, Jeremy Salamon, stops by the trucks to taste their creations and award a prize. After the breakfast shift, Tyler calls with a major Speed Bump. He shuts the trucks down completely until the late night shift. The teams then have to scrape together sales overnight, ending well after the sun comes up.