Daphne Oz guest judges; chefs from the Northeast prepare their signature dishes.

The auditions continue as chefs from the Midwest battle it out for a coveted spot in the top 20. Each contestant has 45 minutes to prepare a signature dish that impresses the judges in order to continue on in the competition

Chefs of the West are the next up in the audition round. Each contestant has 45 minutes to prepare a signature dish that will impress the judges and secure a spot in the top 20

The "United Tastes of America" auditions conclude with chefs from the South.

The home chefs enter the kitchen for their first challenge: creating a state fair-inspired dish.

The remaining home chefs face their first mystery box challenge - apples; with both sweet and savoury flavours on the table, the chef with immunity is tasked with assigning each region which kind of dish to cook.

The home chefs face their first team challenge when they're tasked with pairing up with another region and grilling a delicious meal for 101 firefighters and emergency personnel.

The top 17 home chef's return to the kitchen for their second mystery box challenge, but this time with a twist - one region begins the challenge 10 minutes behind the rest.

The remaining home chefs face the hardest challenge yet in this celebration of "MasterChef's" 250th episode; the kitchen heats up when the chef with immunity is tasked to assign each contestant with an iconic cake to re-create.

The chefs split into two teams to prepare a lunch for over 100 kids at Dodger Stadium; the chef with immunity gets to choose one member from each team who must swap sides and work with the other regions.

In this week's challenge, the Mystery Box is back, and the chefs must individually face the challenge of preparing a gourmet meal out of army rations.

The remaining home chefs must tackle a classic MasterChef test: the tag team challenge. The contestants must take turns preparing a delicious three course meal, working together to ensure they are on the same page every step of the way.

The chefs face their toughest Mystery Box challenge yet - fish! When the chefs with immunity are able to switch up the other contestants' fish, the competition starts to fire up.

The contestants must cater to the average sports fan while incorporating elements from their region to elevate their dish, and the chef with immunity is tasked with giving a penalty to the home cook of their choosing to receive a five-minute timeout.

The remaining nine home cooks are tasked with firing up their grills and preparing a restaurant quality barbecue plate that is guaranteed to impress the judges.

The chefs face their biggest challenge yet: a 55-foot wall. The chef with immunity is tasked with pairing contestants to cook on opposite sides of the wall, where they must rely on great communication in order to save themselves from a double elimination.

With Gordon Ramsay's reputation on the line, the top six chefs face the ultimate challenge of taking over the world's largest Hell's Kitchen restaurant.

The remaining five home cooks take on two rounds of challenges that determine who will move on to the Finals.

The final three home cooks take on their last challenge in the MasterChef kitchen in front of a live audience. Each chef has to whip up a spectacular three-course meal, knowing only one deliberation stands between them and the 0,000 prize.

Judges Gordon Ramsay, Aarón Sánchez and Joe Bastianich crown the next MasterChef champion