1st Service Challengemasterchef Australia : Sea... File

In the 2026 season (Season 18) of MasterChef Australia , the first major challenge was a mystery box challenge in Episode 4 featuring guests Jimmy and Jane Barnes. Casper Kenworthy secured the first immunity pin of the season with a winning spatchcock dish, saving him from the upcoming first elimination challenge. For a full recap of the episode, visit Women's Weekly . Masterchef Australia Season 18 Episodes - Paramount Plus