Nicole Stevenson

An immunity challenge has contestants under pressure to use ingredients from the mystery box in a race against the clock.

Contestants are split into teams for a challenge at South Melbourne Market, before the weakest two teams are forced to participate in an elimination round.

International celebrity chef Curtis Stone is in the house to set the Mystery Box challenge. Contestants have an hour to impress the judges to avoid the elimination round.

Contestants have their heads on the chopping block, as they tackle the mystery box. They are tasked with making a great dessert, but only five will be tasted before the immunity challenge.

A mystery box of Thai ingredients and only 75 minutes to cook has contestants stumped, as they try to gain a huge advantage for the upcoming invention test.

The contestants participate in a relay challenge after they are split into teams of four. Challengers each have 15 minutes to cook, and just 45 seconds to pass their dish on to their team-mate.