Season 15 begins with the newest bunch of contestants traveling to Las Vegas to see where the winning chef will work and preparing their signature dishes in that kitchen for the chance to win a ride on the High Roller Ferris wheel. Later, dinner service goes bad fast for one unlucky team.

The teams have 20 minutes to make the most shrimp dumplings during a distraction-filled challenge. Also: The Game shows up unannounced during dinner service.

A communication challenge comes with a relaxing retreat in Santa Barbara for the winning team, while the losers gut 100 lbs. of seabass for the next dinner service. Later, the contestants cook for astronaut Buzz Aldrin.

An early-morning rubber duck hunt determines what ingredients the teams use in the next challenge, the winner of which gets to spend the day on a yacht. Later, tempers flare during dinner service as the 15 remaining chefs scramble to feed VIP guests Kris Jenner and Dita Von Teese.

The contestants work in pairs to create three main dishes with different holiday themes celebrating the Fourth of July, Cinco de Mayo and Mardi Gras. Later, tempers flare during family night and both teams face being kicked out of the kitchen.

A new member joins the Blue Team before a grocery spelling challenge, after which the winners go flying in a stunt plane, while the losers make sangria. Later, Thomas Ian Nicholas and Omar Benson Miller are VIP guests for a tense dinner service that offers some chefs the chance to shine as their competitors fall apart.

The 11 remaining chefs come up with unique dishes for Andi Van Willigan's wedding reception, which they will cater. Included: Following the team challenge, the winners go zip-lining in Las Vegas, while the losers prepare a mountain of macarons.

Grammy Award-winning guitarist Steve Vai performs for the 10 remaining chefs. During dinner service, they work to impress celebrity guests Garcelle Beauvais and Jonathan Loughran.

Two contestants swap teams prior to a challenge that finds them cooking bison with international flair. Winners get to visit Hollywood animal actors, while the losing chefs bake bread and hand-churn butter. Later that evening, VIP guests for a "cowboy steak night" include Fox News contributor Stacey Dash and Olympic gold medalist Phil Dalhausser.