The chefs present their signature dishes, with the winners getting a night with William Shatner.

Crab cakes are prepared by the 17 remaining contestants after they retrieve the main ingredient for their dishes from the ocean. Later, seafood is a problem for one team, which leads to their early expulsion from the kitchen.

A seafood battle finds the 16 cooks having to successfully match the heads and tails of some popular fish and then create dishes to impress guest judge Michael Cimarusti. Later, dinner service gets off to a rough start as one team struggle to make it past the first course.

The Top 15 contestants face chopping more than 500 pounds of onions if they lose the first challenge, which is to prepare American comfort food for two guest judges. Later, a special family-style dinner service ends with an elimination.

An ocean adventure is up for grabs as the teams try to impress chef Gordon Ramsay during a cheese challenge. Later, emotions are elevated as the 14 remaining contestants work to avoid elimination and complete a star-studded dinner service.

The 13 remaining contestants prepare a special lunch for two charitable organizations involving active and retired firefighters in Los Angeles. Later, dinner service becomes tense and multiple chefs are ordered to leave the kitchen.

The contestants compete to create Greek-inspired dishes, with the winners getting a trip to the go-kart track; chef Michael Psilakis guest judges; Ramsay kicks one team out during dinner service, leaving the other to cover.

John Ratzenberger judges the contestants' food pairings; while the challenge winners spend the day at a famous roller rink and go on a beer tasting, the losers prepare linens for dinner service; gastropub night doesn't go smoothly.

A challenge involving exotic proteins, including alligator, ostrich and wild boar, is followed by chef Ramsay giving the remaining nine contestants one-on-one evaluations and sending one of the weakest team members home.

The remaining 8 contestants must present three courses to the discerning palates of the Calabasas High School Homecoming committee, which has requested Mardi Gras-inspired cuisine.

Gordon conducts a blind taste test; and the remaining eight contestants must serve a five-course dinner to guests of a major charity event.

Seven contestants remain to prepare a premiere dish using various cuts of steak in less than 35 minutes.

Six chefs compete in pairs during the "Taste It and Make It" challenge for the chance to win a visit aboard the Queen Mary ocean liner.

The top five chefs must prepare a unique and elegant small-plate dish in under 45 minutes for people attending a private symphony performance; the challenge winner earns a private helicopter tour of Los Angeles; the top four chefs are revealed.

Protein is off limits when the final four chefs compete in a vegetarian challenge. Later, they receive a surprise visit from friends and family before a dinner service that determines who's going to the finale.

The finalists prepare five dishes to be judged by renowned chefs, including Wolfgang Puck.