Teams compete to construct junk machines, using what they can scavenge from the scrapheap.
The Vikings, a team of Dark Ages battle re-enactment enthusiasts from Salisbury, face off against the Beach Bums, a team of surfers from Torquay, to construct a machine which can hurl a human-sized mannequin into a disused quarry.
The Engineering Eggheads, a team of mechanical engineering students from University College London, compete with the Diggers, a team of heavy plant engineers from Hull, to build 5m-long "monster" trikes, that can race head-to-head over a slalom course, carrying all four team members.
Plymouth's Super Subs vie with Sweet Chariots, a group of rugby players, to construct a train they has powered by the teams muscle.
Suffolk builders The Cement Mixers, and Dorset cab drivers The Turbo Taxis build and race snowmobiles.
In this episode Woof Justice take on The Bus Boys in a race to create the most accurate and more mobile Mechanical Mortars.
In this episode The Beach Bums face The Diggers to see who can build the better Airboat.
This week The Turbo Taxi's and The Super Subs have to make mechanical sumo cars that are capable of pushing the other teams vehicle out of the arena.
In the first semi-final the Beach Bums face the Extinguishers to see who can make the best machine capable of moving mounds of earth.
In the second semi-final Woof Justice face the Turbo Taxi's for a place in the final by building the fastest Drag Sled.
In the final of this series Woof Justice take on the Beach Bums to see who can make the better swamp racer and become the Scrapheap Challenge champions 2007.
In the Grand Final, this series' winners Woof Justice take on last series' winners the Powerlifters to build Bulldozers from scrap.
Dick Strawbridge gives two teams four weeks in which to build racing chariots, before facing Dick and his team in the final at Hever Castle in Kent.
Brothers in Arms go up against the winner of Bomber (3 Revs a Minute or Mothers of Invention) in a challenge to build a vehicle that can carry all four members across a 30-foot ravine. The vehicle must also be capable of both deploying a bridge and retrieving it once the team is across. The Brothers go for a van-based bridger, while their opponents use bikes.
To get the series off to a smashing start, the first episode challenges the teams to break one of Scrapheap's longest-standing records. Back in series six, The Catalysts set a top speed of 72mph in the Grand Prix Challenge. Now The Rocketeers, a team of pyrotechnicians from Bath, and The Brum Brums, motor mechanics from Birmingham, are challenged to beat that time, in the scrap speed record attempt. Where better to do it than historic Pendine Sands, the spiritual home of British land speed record attempts? The teams are under expert scrutiny as they attempt to race their way into the 'heap record books - this week's judge is two-time land speed record-holder Richard Noble.
This week's mechanical migraine promises to be a Scrapheap classic. The teams must build contraptions to throw a 100-kilogramme scooter as far as they can, without the help of compressed gas or gunpowder. The Balloonatics, a trio of hot air balloonists from Liverpool, take on The Aquarium Crew, a team of aquarium constructors from Dorset.
In this episode the two teams must make Off Road Buggies from the scrap.
Inspired by the sleds used to test supersonic planes and spacecraft, the teams are challenged to build a superfast railway... but all usual forms of propulsion are banned.
The teams are challenged to build super snow shifting machines as well as having to race up a ten-degree slope in temperatures of minus four degrees.
Two teams have reached the final and now they have just ten hours to build a tow tug capable of pulling a 155 ton jumbo jet along.
Fire Engine Returning to the 'heap for the first semi-final are Surrey estate agents, Hot Property and Fifties fanatics, Rockin' Rabble. This three-round contest requires the teams to demonstrate the various capabilities of a modern fire-fighting appliance, including rescuing cutesy kittens and battling against raging blazes. Hot Property Ross Lindsay is an estate agent who works for Townends. Craig Smith and Scott House are the company's financial advisors. They are a confident team, great negotiators and have promised to play fairly. Hot Property are as safe as houses and in it to win it! For this fiery task, Hot Property are joined by Yorkshireman Kevin Sedgwick, the laidback engineering manager for Angloco, a fire engine manufacturer that builds anything from tiny water tankers for Guernsey to enormous ladder trucks for Barbados. Kevin has been with them for thirteen years. Many moons ago, he started off as a mechanic, so practical skills aren't a problem. In his spare time, he tinkers around with his two historic racing bikes and the monstrous Guzzi 1100 that rattles the windowpanes in his local neighbourhood. Rockin' Rabble Geoff Bunting, Trevor Cartwright and Philip Lodge are a team of Yorkshire Teddy Boys who intend to bring a touch of retro culture to the 'heap. They are Fifties fanatics and are ready for some rockin' and a rollin'. They've agreed to switch off their jukebox and stop living in the past to concentrate on stepping to Scrapheap success. This time, the Rockin' Rabble's technical consultant is Mike Madsen, the bubbly, youthful technical manager for Emergency One, a leading fire engine manufacturer near Glasgow. He dropped out of school at the tender age of 16 to become a computer programmer but then went back to university to study engineering and business. After his first visit to Emergency One, he fell in love with the big red monsters they build. He tinkers for a hobby and has littered the world with the badly
In this episode the two teams most make machines capable of moving heavy weights.
This time, a team called Filth goes up against the winner of Demolition (Chaos Crew or Beach Boys) to design and build a machine that can throw a rugby football as far as possible using only their own muscle power, so no motors allowed. They have to create something that can store muscle power gradually, then release it in a controlled burst. Filth decides to ignore their expert and creates a huge cross-bow-type machine. The other team decides to pump up an air cannon to shoot the ball. And while the winner can't be revealed, one team captain manages to throw his rugby ball farther than his machine could.
It's a decorator's dream as two teams compete to build a mobile painting machine capable of decorating a house from a distance
The teams must build super-swift vehicles capable of racing up and over the Scrapheap's very own desert dunes.
The teams compete to build wave-pounding power boats capable of skimming across the Scrapheap lake. And it's not as easy as it sounds.