Expect the unexpected with a season of secrets and surprises. Judges Melissa Leong, Jock Zonfrillo and Andy Allen are joined by special guest Jamie Oliver.

Jamie Oliver is back for another day in the MasterChef Australia kitchen! Contestants must bring their A-game if they want to secure one of two spots in the first Immunity challenge of the season.

There's a catch to the flavour bombs that Jamie Oliver has left behind for the contestants to cook with today - they will only be revealed 15 minutes into the cook and must be included in the dish.

Contestants must raid Shannon Bennett's fridge to create the tastiest dish in 45 minutes. The winner will go head-to-head with Vue de monde's Hugh Allen in the hope of winning an elusive immunity pin.

Contestants fight to stay alive in the first elimination challenge of the season. Cooking from favourite childhood memories, the least impressive dishes over two rounds will send its maker home.

This season's first Mystery Box sees fan favourite Poh Ling Yeow back in the MasterChef kitchen for one night only. Contestants must create a winning dish with just under bench staples and little else.

Former MasterChef winner and dessert queen Emelia Jackson is here to share her secrets. Using Emelia's choux pastry recipe, contestants must create a superb sweet or savoury dish to avoid elimination.

Get your orders ready, its time for the first Service Challenge of the season. Two teams, aided by mentors Matt Sinclair and Sashi Cheliah, must cook an entree and a main course dish for 30 diners.

Winner winner chicken dinner! Contestants must turn Andy's spit roasted chooks into a banger dish, with the winner cooking off for an Immunity Pin against Three Blue Ducks chef, Darren Robertson.

MasterChef royalty Julie Goodwin returns, and survival is on the menu. Those who pick a wrong ingredient in Julie's seafood stew must cook to avoid elimination using only the items in Julie's recipe.

Big Week lives up to its name as the contents of MasterChef's biggest ever Mystery Box are revealed. Contestants must think outside the box and big up the flavour to avoid tomorrow's Pressure Test.

Pressure Test elimination looms as three contestants strive to replicate Eddie Stewart's Tokyo Lamington Tower, featuring Snickers, strawberry matcha, charcoal pumpkin and yuzu curd meringue flavours.

As thousands of hungry punters descend on Melbourne's hip Grazeland, it's surf and turf for the masses with two teams vying for a shot at Immunity in MasterChef's biggest ever service challenge!

With an Immunity Pin at stake, whoever creates the best dish with a mystery appliance in round one will earn first pick of flavour pairings and a 15 minute head start against guest chef Sergio Perera.

Slow and steady keeps their place! Facing elimination, contestants embark on a two-day challenge with 45 minutes to marinate, pickle, brine and more in an overnight cook to finish off the next day.

Contestants try to bowl the judges over by elevating humble breakfast cereals into nostalgic classics. Who will cry over spilt milk with a Pressure Test awaiting the worst cereal offenders tomorrow?

Guest chef Donato Toce reveals his superb Viennetta ice cream cake. Pressure Test contestants will need ice in their veins to replicate the nostalgic dessert or risk being frozen out of the kitchen.

Two teams must wok hard to create a sumptuous banquet at a suburban Chinese Restaurant as they hope to takeaway a crack at Immunity. Will our judges deem their plates of fortune to be sweet ... or sour?

Great frypans of fire! It's an Immunity Pin fracas as a field of faves fan the flames in a flipping flambe free-for-all. Who will face fab French foodie Gabriel Gate in a fierce fight to the finish?

Fancy a final trip down memory lane for a '70s-themed dinner party? A little fermented curd will do the trick! Then, time travel for the taste buds leads to a tearful farewell to one contestant.

It's home cooks versus pro cooks in a culinary smackdown. The gloves are off as three contenders go toe-to-toe with Jacqui Challinor and her Nomad Restaurant warriors. Who will deliver the knockout blow?

Three more contestants battle the best of the best, dueling with Nick Holloway's Nu Nu crew in a mind-blowing three-course Pressure Test whipped up by Aru and Sunda Restaurant's gifted chef, Khahn Nguyen.

Louis Tikaram and his Stanley Restaurant team sprint to the kitchen for a blind relay against three MasterChef contestants. With no handovers and zero communication... who will be the runaway winners?

Who can knock Jock's socks off in a shock rock around the clock? Three cooks face the chopping block against Serai's flock. Time is docked for the best stock. Tick tock, tick tock, don't get crocked!

Our home cooks are wading into treacherous waters as global seafood superstar Rick Stein brings his best squid game. Who will end up sleeping with the fishes in a chaotic aquatic 2-part challenge?