Katy Perry guest judges a very special Hot N Cold challenge to honour the iconic MasterChef theme song. The contestant with the best dish will find themselves safe from Sunday's elimination.
Starts: Melissa Leong, Jock Zonfrillo, Andy Allen, Katy Perry, Tessa Boersma, Laura Jane Cassaighe, Sarah Clare, Tracy Collins, Callum Hann, Reece Hignell