This competition pits pro chefs and home cooks from around the globe against each other in a battle between the bread. These culinary masters have blazed through regional qualifiers and descended on Las Vegas for a three round sandwich showdown. In the first round, contestants must create a signature sandwich. In round two they must reinvent a classic sammie. For round three the field is narrowed to the top ten who face their biggest challenge yet--incorporate a mystery ingredient into the sandwich of their choice.