In this episode, John and Gregg recall the celebrity contestants’ first experience of a professional kitchen. From tackling mountains of prep, to facing unfamiliar and often frightening ingredients, to being overwhelmed with orders during a busy lunchtime service, the MasterChef judges look back at those who thrived and those who only just survived the intense pressure. John and Gregg also revisit a classic challenge from 2013 which saw the celebrities cook a high-end three-course meal for 150 people at Cambridge University. Broadcaster Janet Street Porter, boyband singer Shayne Lynch, comedian Les Dennis, rapper Speech Debelle and actors Brian Capron and Ade Edmondson took part in one of the most ambitious semi-final challenges ever set to a group of celebrities, pushing them above and beyond their culinary limits.