Home cooks serve up their signature dishes to judges Gordon Ramsay, Joe Bastianich and Aarón Sánchez and guest judge Emeril Lagasse.

The home cooks have 45 minutes to impress the judges, including guest judge and legendary Michelin Star chef Curtis Stone.

The final audition round of the season; guest judge Paula Deen.

Legendary Michelin Star chef Masaharu Morimoto sets the bar high with his monkfish demonstration, leaving the cooks desperate to impress in their first elimination challenge.

One of the world's most influential pastry chefs, Sherry Yard, visits the kitchen; the dessert challenge puts the spotlight on the home cooks' baking skills for the first time.

The cooks must create a beef dish without knowing what cut of beef they will be cooking until the mystery box is opened; guest judge Michael Mina.

Michelin Star chef Nancy Silverton challenges the home cooks with a fresh pasta challenge.

The top 10 home cooks take on a Californian mystery box challenge; guest judge Jonathan Waxman.

The pioneering king of the food truck revolution, Roy Choi, tasks the home cooks with making a street food dish worthy of a Michelin star restaurant.

Chef Ramsay challenges the home cooks to create a dish for the most important legend yet -- their own personal legends; one home cook's dish ends up on the chopping block.

The cooks must pair up and make the same exact dish -- without being able to see one another.

Chef Niki Nakayama gives the cooks a taste of Japan.

A team challenge pits boys against girls; guest judges Val Cantu, Jonathan Yao, Sherry Yard and Tanya Holland.

Legendary French chef Ludo Lefebvre joins to guest judge a mystery box challenge with a twist; the cooks must make two elevated French Bistro-style dishes in 90 minutes to guarantee themselves a spot in the semifinals.

The remaining four semifinalists tackle a brand-new culinary triathlon that sees the home cooks making three dishes back-to-back alongside three different legendary chefs: Nyesha Arrington, Suzette Gresham and chef Ramsay himself.

The remaining four semifinalists tackle a brand-new culinary triathlon that sees the home cooks making three dishes back-to-back alongside three different legendary chefs: Nyesha Arrington, Suzette Gresham and chef Ramsay himself.

Chef Curtis Stone guest judges for the semifinals when the top three battle in the appetizer round.

Chef Michael Cimarusti guest judges as the finalists try to impress with their entree and dessert dishes; the winner is crowned.

Former "Masterchef" contestants return; chefs compete in head-to-head audition battles.

Three chefs who competed in the junior edition return to compete for the first time as adults.

With only six aprons left, the judges give a lucky few chefs a chance to return to the kitchen.

All 20 chefs must cook something inspired by the dish that originally sent them home.

Cocktail connoisseur Shaun O'Neale gives the chefs their first mystery box challenge.

The top 18 travel to the U.S. Coast Guard base in Los Angeles for the first team challenge; the chefs work together to create a lunch for more than 100 men and women; one contestant will be eliminated.

Gordon Ramsay transforms his infamous beef wellington into a vegan dish made out of beets.

The remaining chefs must cook a Southern dish inspired by flavors from countries around the world.

One chef selects a dessert for each of their fellow competitors to bake to perfection.

More than 100 cowboys and cowgirls gather for a rodeo; the chefs divide into two teams.

The chefs face a "Winner's Mystery Box," curated by the Season 3 champion, Christine Ha.

The top 12 chefs are challenged to a tag-team cook-off.

The chefs partner with GrubHub to elevate a traditional take-out dish into a gourmet concoction.

The chefs are challenged to turn traditional gas station and road trip snacks into gourmet dishes.

The top nine chefs face a Mystery Box Challenge from Season 9 winner Gerron Hurt.

The top eight chefs are paired together and must communicate on opposite sides of a wall to create identical dishes.

The chefs must take over chef Wolfgang Puck's kitchen at Spago restaurant in Los Angeles.

The top five chefs are faced with two separate elimination challenges in the semifinals: a baked Alaska and an intricate lobster tortellini.

The top three chefs have made it to the finals and are one challenge away from being crowned the "MasterChef" champion; each chef has to prepare an appetizer and entrée in front of a live audience with the support of former judge Graham Elliot.

The three remaining chefs rush against the clock to complete their final entree and whip up a gourmet dessert with the help of former judge Christina Tosi. Then, a new MASTERCHEF champion is crowned.

Tonight, America’s top home cooks from four generations (Baby Boomers, Gen X, The Millennials and Gen Z) arrive at the MasterChef kitchen to battle it out for a coveted white apron and a spot in the Top 20.

The generational audition rounds continue as home cooks from the Baby Boomers go head to head for a coveted white apron.

The third generation facing the MasterChef audition gauntlet tonight is Gen Z. So far, 10 aprons have been handed out with another five up for grabs.

It's the final night of generational auditions as home cooks from Gen X fight for one of the final five aprons.

The Top 20 are thrown in at the deep end tonight with their first MasterChef Mystery Box Challenge.

In a season that's all about age, tonight’s challenge is testing whether the home cooks have the culinary skill and maturity to handle cooking with aged foods.

The home cooks are out of the MasterChef kitchen for their first field challenge of the season.

The top 17 cooks face their first baking challenge as the judges welcome them back to the MasterChef kitchen for one giant birthday party.

The home cooks take on their second Mystery Box challenge of the season, but this time, each of the four generations has only one massive Mystery Box which they must share.

Tonight the amateur home cooks are tasked with making dishes with beer.

The top 13 cooks face their second challenge away from the MasterChef kitchen.

The Top 12 home cooks face one of the most intense MasterChef challenges, the infamous Tag Team!

It’s time for the cooks to wake up and smell the coffee as the Top 11 are challenged to make Michelin star dishes using just that - coffee.

Tonight, the judges spice things up for the Top 10 home cooks, who lift their mystery boxes to find an array of hot ingredients.

The home cooks' communication skills are put to the ultimate test tonight, as they must work together in teams of two to create a dish that looks and tastes exactly the same - all while working on opposite sides of a giant wall.

The stunning Los Angeles downtown skyline and a unique open air pop up is the setting for tonight's daunting challenge.

With the MasterChef finale just around the corner, the top five home cook’s have to prove themselves in a grueling Semi Final with back to back challenges.

It's time to finally find out which generation has the best home cook. Only one home cook will be crowned the next MasterChef and take the title, the trophy and the quarter of a million dollars.

It's time to finally find out which generation has the best home cook. Only one home cook will be crowned the next MasterChef and take the title, the trophy and the quarter of a million dollars.

For the first time in history, pairs of home cooks will participate together, in hopes of becoming America’s Next MasterChefs.

Tonight, the remaining eight pairs of home cooks go head-to-head in the audition battles, for a chance to win coveted white aprons.

Tonight, the duo’s who failed to get white aprons in the audition rounds, get a surprise second chance.

For their first challenge of the season, the Top 12 duos must impress the judges with their finest dinner party dish.

In the first Mystery Box challenge of the season, the Top 11 duos enter the kitchen to find not one, but two boxes at their station.

The Top 10 duos head out of the MasterChef kitchen for their first team challenge.

The five duos on the losing team from the previous challenge face the first Pressure Test of the season.

In a MasterChef first, the Top 9 duos face a brand-new challenge of ‘Recipe Telephone’.

The Top 8 duos are halfway through the competition and the challenges are getting tougher by the week.

The four duos on the losing team last week fight for survival in a new Pressure Test challenge.

Tonight's challenge is all about mastering one of the toughest desserts in the world - the beloved macaron.

The MasterChef garden is decked out for a sunny backyard BBQ and the Top 6 duos feel the burn.

The three duos from last week’s losing team face the final Pressure Test of the season.

With the Grand Finale just around the corner, the Top 5 duos face a MasterChef rite of passage - The Wall.

With a place in the Grand Finale on the line, the Top 4 duos face their biggest test yet in the Semifinal challenge: 'Keeping up with Gordon'.

In honor of the lead up to the finale, MasterChef celebrates the highs and lows of Season 15.

The Top 3 duos face their last, most intimidating night of cooking in the MasterChef kitchen for the Grand Finale.

The Top 3 duos face their last, most intimidating night of cooking in the MasterChef kitchen for the Grand Finale.