Teams compete to construct something practical using only scrapyard junk. The contestants build a working machine that can do a specific task, using the materials available. The teams are given ten hours.
A trio of forklift truck drivers from Kent take on three army helicopter pilots from the home counties in one of the most dangerous challenges ever attempted.
The Lumbering Jacks face off against the Haggis Bashers to build vehicles capable of chopping their way through a range of extremely tough targets in just 10 hours.
The Stage Crew face the Big Dippers to see who can build the better rapid-fire arrow launcher.
AC/DC Dairy Dash: Cornish, classic Jag lovers the Beasts of Bodmin take on The 7s, a team of easy-going Essex bikers, to construct battery-powered milk floats.
Three racing car engineers take on a woman rally champion and her pit crew. They have just 10 hours to build the fastest machines on water the show has ever seen.
The teams must build mechanical fishing rods; they try to land three full-size minis as the catch of the day.
Two teams go head-to-head to build machines capable of racking up points on a giant ice-bound pinball game.
Caber Tossers: Three teams build machines capable of tossing a 70kg, 18-foot caber through 270 degrees. Who's got the brawn and the brains to win the day?
The challenge is on to see who can build a steeplechaser with horsepower in the Scrapheap semi final.
In this semi final, The Big Dippers meet The Powerlifters to construct a super-fast monster machine at least five metres long and weighing at least 5.5 tonnes.
Rockcrawlers: Two teams compete to build a boulder-bashing rock-crawler capable of scrambling over a course hewn from the side of a stone quarry.
The Best Of: A compilation of the best moments from the challenge series following teams of amateur engineers as they compete to create mechanical devices.
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