Contestants are shopping for their own mystery box ingredients with only $20 and 20 minutes. Maker of the best dish goes through to the immunity challenge, followed by the winners of the invention test. This will be the most feared challenge: The Team Relay. What will Ben do that will make or break his team? What will be the big surprise in the mystery box?

The winner of Sunday night's mystery box, along with the members of the winning team in the invention test relay will compete for a coveted immunity pin.