Ben is at his favourite childhood beach at Hawley, where he cooks char-grilled pesto chicken skewers with a charred lemon dressing cooked over the coals of his hibachi grill. At the University of Queensland St Lucia Campus, standing outside the Natural Amphitheatre, Ben is joined by venom expert Jordan Debono as they make hot and cold homemade pickles.
The four remaining teams each contribute to a Time Train diorama built in 16 hours. From the Wild West, the Future, Prehistoric and Medieval Times, this challenge will mark the end of one team's journey and reveal our grand finalists.
Teams must duplicate the classic DeLorean car from Back to the Future - the real thing present for reference. Next, they re-create an iconic moment in cinema in a vignette on their tables, with the least impressive team saying farewell.
Ben purchases a fresh mahi mahi from a Chennai fish market before heading down to the beach to cook a mahi mahi crudo. He uses a personalised spice mix that Ben picked up from the Lalbagh spice market in Mumbai.
At Ben's restaurant Charlotte Jack, Ben cooks Dr Vigya Sharma a charred cos lettuce dish with a creme fraiche dressing using fresh, locally sourced produce.
Ben and Vigya are at the Ghost Rock Vineyard enjoying a platter with Ben's three favourite Ghost Rock wines, the sparkling, rose, and Pinot Noir.
Imaginations are let loose in this challenge where teams must create an evil lair for a supervillain Minifigure in 13 hours, including a vehicle. The least impressive villain world will ultimately send its makers home.
Ben will be joined by Vigya Sharma as they pick up a coffee at one of Ben's favourite spots before heading to Devonport's Bluff Beach to eat seafood sourced from the Bass Strait right behind them.
In a test of their engineering skills, teams must construct a bridge across a 2m canyon with no centre support; the winning structure will be the one to withstand the most weight. With 10 hours on the clock, the race is on.
At Devonport's Roundhouse Park, Ben will be joined by Dr Vigya Sharma, who examines India's energy policy paradox using non-Western philosophy. They discuss why energy is so important for India's growth.
Teams must break apart Brickman's parrot to create something original in four hours. They'll then build an impressive three-storey apartment in 10 hours, stacking on top of each other's.
Ben is at the Ashgrove Dairy Farm as he fires up the OzPig and makes a delicious barbecue quail dish using fresh figs to make a balsamic dressing. At the University of Queensland St Lucia Campus, Ben and Joel are in the Chemistry Courtyard as they show you the best way to turn your leftover ingredients into an Italian Tuscan bread soup.
At the Ashgrove Dairy Farm, Ben is making a delicious buttery grilled corn using a butter that he made with Paul earlier to baste over the corn. He places it over the coals of the OzPig to give it that beautiful smoky flavour.
Ben is at the Ashgrove Dairy Farm. With a fish basket, he will cook a fresh rainbow trout over the coals of the OzPig. He makes a simple yet creative Mexican rainbow trout dish that falls straight off the bone.
In the first elimination, teams must turn everyday items that have been cut in half from normal to incredible. A bike, a typewriter, a TV and a violin must be morphed into something completely new using only Lego.
Ben is at the Ashgrove dairy farm with Paul Bennett. They use an old butter churner that belonged to Paul's grandmother to make their own butter to go with their garlic prawns, which will be cooked on Ben's OzPig.
Ben is at the Ashgrove dairy farm, joined by Paul Bennett, and he gets to see the process of how the fresh dairy produce is made from start to finish. Paul talks about the advantages of farming in Tasmania and how it helps produce the best quality produce.
Teams have seven hours to make an amazing space-themed creation, but they will be judged on how spectacularly it breaks when destroyed by various means: baseball bat, high-speed crash, 6m drop or explosives.
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