Trent Devincenzo

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

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.

The team who came last in the relay challenge face elimination, and must battle it out between them to see who will be next to leave. They each have 90 minutes for buying ingredients.

The top 24 face their first mystery box challenge. The bottom four cook off in an elimination challenge, resulting in one contestant being sent home.

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.

The judges welcome a fresh batch of home cooks to tackle creative cooking challenges in order to win a spot in the Masterchef Australia 2017 competition.