The Crystal Maze
The Beach Bums from Devon take on the Vikings from Salisbury in an attempt to build human cannonball devices.
The Engine Eggheads from London take on the Diggers from Hull scouring the scrapheap for the parts they'll use to build monstrous motorised trikes.
It's all aboard the Scrapheap Express as two teams of engineering obsessives attempt to build trains with a difference: they're human powered.
Suffolk builders The Cement Mixers and Dorset cabbies The Turbo Taxis have ten hours to build snowmobiles from scratch, using just the junk littering the Scrapheap.
Norfolk firemen the Extinguishers and vintage railway buffs the Steaming Scots are set a classic challenge: to build and race giant motorised skateboards.
The teams must build mortars that can not only lob miniature basketball ammo over varying distances with pinpoint accuracy, but also be moved across rough terrain.
The Diggers from Hull and The Beach Bums from Torquay must race to build Florida-style airboats to skim round the Scrapheap's very own alligator-infested Everglades.
Scrapheap is going Japanese with a heavyweight challenge: the teams have just ten hours to construct giant motorised sumo wrestling machines that will do battle on a slippery skid pad.
Large-scale construction projects are the inspiration for this semi-final as Devon surfers The Beach Bums take on Norfolk firemen The Extinguishers.
Geordie police dog handlers Woof Justice and West Country cabbies The Turbo Taxis compete to build and race massive drag sleds.
The two finalists met down in the swamp. The challenge - to race across the mud and water in the fastest time. The winning team takes home the Scrapheap crown.
The champions from 2007, Woof Justice, take on the 2006 champions, The Powerlifters, to compete for the 'Rings of Steel' trophy.
In tribute to the Godfather of British engineering, Isambard Kingdom Brunel, the teams are given two days to build paddle boats capable of crossing the Scrapheap equivalent of the Atlantic.
The Motor Museum at Beaulieu is the setting for a unique racing event as 16 teams from around the country race home-built motorised furniture at breakneck speed around a special track.
At the Great Dorset Steam Fair, 16 teams have constructed eccentric machines designed to throw Wellington boots as far as possible.
Robert Llewellyn and Lisa Rogers look back over the highlights of another year on the Scrapheap. The programme will hear from the contestants who have made this yeat so memorable.