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.