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British Olympian Claire O'Hara attempts a kayaking record with her husband in Sydney, Australia. And drag racer Tom Bagnall goes for glory in a go-kart - with a jet engine on the back! Also, we welcome back our Officially Competitive legends - Cherry, Ray and Steve - competing for records in front of a live audience in our secret bunker.

The Officially Competitive heroes are engaged in a sparkly contest to move glitter with a teaspoon, then later one of them faces a trek to the gruesome Gunge Tank of Doom. Also, a flying quad bike from America, multi-medal-winning Olympic gymnast Becky Downie defies belief on a balance beam and two monster trucks rampage around a field in Australia - on two wheels.

Australia's all-time greatest record breaker tries to catch the fastest tennis ball ever, at over 200 kph! An American daredevil dunks a doughnut in a mug of coffee via a bungee jump, and Britain's best stunt car driver Alastair Moffatt, returns, aiming to drive a car on two wheels around cars driven by his entire family. In the bunker, the Officially Competitive legends attempt to become the world's fastest at running with a balloon between the knees.

The astonishing world-record attempts causing chaos in the bunker this time include a daredevil resisting the power of a jet-engine stream, Olympian Ashley McKenzie throwing his brother-in-law in a judo record, and a pirouetting poodle! Also, Mr Cherry, US Ray and Sizzling Steve take on a fiendishly tricky burpee record, with a hilarious outcome, and one of them faces a gunging.

Featuring the return of dazzling daredevils the Bold Dogs who will somehow combine awe-inspiring motorcycle stunts with... basketball. There's also a somersaulting master of the 2wheel board from Australia and a happy couple from America will attempt a skipping record - with a spiky and painful difference. Also, in Officially Competitive, it's the first team event of the series - just who will peel and eat an orange the fastest, while blindfolded? And which one of the legends will end up in the feared Gunge Tank of Doom?

It's the return of hula-hooping legend Marawa, who attempt a record involving three hoops and a pair of roller skates. Two brave heroes from China compete to climb some stairs... on their hands. And we find out if speed-skipping sensation Peter 'Skip Beatz' Thompson can top his own super-fast skipping record. Also, Sizzling Steve, Mr Cherry and US Ray will clash once more in their quest to be crowned as Officially Competitive Champion - but which one of them can balance a fidget spinner on their nose for the longest? Ben Shires, Haruka Kuroda and Desiree Burch will be on hand to find out.