The contestants face a mystery box challenge where they must create a dish using one common ingredient – walnuts. The winner will receive three huge advantages. Later, the MASTERCHEF kitchen welcomes American soccer legend and FOX Sports Soccer Analyst, Alexi Lalas, who will introduce a street food themed elimination challenge that involves popular food among soccer fans in various countries. Then, it is up to the judges to decide who will head home.

In this week's first challenge, the contestants face a mystery box filled with fresh seafood and must create a dish using two items from it. The chefs who fail to impress the judges will face an elimination challenge and be asked to upgrade one of the most popular frozen dinner dishes, Salisbury Steak.