The Irn Cru and Maximus are challenged to build dam-busting devices from junk in ten hours that can pitch projectiles across water.
The Destroyers and Hot Property are challenged to build the meanest tanks from junk.
Two teams are challenged to build a contraption from junk in ten hours that can skim full-size cars across an ice rink.
Two teams are challenged to build a fire engine capable of extinguishing an inferno and navigating a slalom course.
Two teams are challenged to build super-slick speedboats from junk.
Two teams are challenged to build jet-powered cars from junk in just ten hours and then turbo charge down the legendary drag strip at Santa Pod.
The Iron Maidens and the Jousters are challenged to build enormous flinging machines that will chuck giant darts at an oversized dartboard.
Two teams are challenged to build the fastest ice-racing vehicle from a pile of scrap.
The Rocking Rabble and the Double Deckers are challenged to build a pair of amphibious motorbikes from junk.
The teams assemble and race their vehicles before disassembling and putting them into their backpacks to run across an assault course.
Robert Llewellyn and Lisa Rogers challenge two teams to build a bomb-disposal machine from junk.
RAF engineers and the Royal Navy team are challenged to build a gravity-defying wheelie car that will race on two wheels.
Jaguar engineers and Devonshire farmers are challenged to build machines mighty enough to fling cars.
The Barley Pickers battle the Boat Buoys to build destroyers from junk that can sink the enemy team's giant galleons in a massive water war.
Coventry wrestlers and Devonshire farmers are challenged to build a digger from just scrap in just ten hours.
Teams compete to build a vessel that can compete in a tug-of-war on water with propellers being banned.
Wrestlers and engineers are challenged to build a vehicle that allows both rider and engine to fit within a single tire.
Two hand-picked groups from the very best shows of the past decade build hovercrafts that will carry all three team members across both land and water.
Two teams fight it out to see who can build the meanest mud monster that will get across the sticky swamp without getting bogged down.
Two teams turn a car into a remote-controlled machine.
Teams must build a hydrofoil that can carry one team member as fast as possible up the length of the lake.
Robert Llewellyn and Cathy Rogers challenge two rival teams to construct the ultimate tunneling machine.
Robert Llewellyn and Cathy Rogers challenge two rival teams to build a one-man hill climber completely out of junk.
Robert Llewellyn and Cathy Rogers challenge two teams to build the best machine that will clean up a beach resembling a minefield.
Robert Llewellyn and Cathy Roger challenge two teams to build the best machine capable of lifting and moving scrap.
Two teams attempt to build snowmobiles from junk in just ten hours before racing on the world's only indoor snowmobile track.
Robert Llewellyn and Cathy Rogers challenge two teams to build the best powerboat to travel along a stretch of wild water.
The Cat-Alysts compete against The Chaos Crew to build a four-man machine that can clean up a littered street.
The Chairmen battle with the Top Guns to build reusable torpedoes that are used to attack boats along the water surface.
Two competing teams attempt to build the biggest monster trucks to crush a line of cars before racing over the finish line.
Robert Llewellyn and Cathy Rogers challenge another two teams to build an egg shooter entirely from junk.
Brothers in Arms battle the North American Nerds for the prestigious Scrapheap Challenge title in the season finale.
Robert Llewellyn and Cathy Rogers challenge two teams of amateur engineers to build and race a steam-powered car from junk able to carry all four team members.
Robert Llewellyn and Cathy Rogers challenge two teams to build a giant motorized mower out of junk that is capable of cutting down a one-acre field of wheat and collecting the crop.
The teams must build a self-propelled bridging machine, cross a five meter wide ravine, then race for the finish line.
The Beach Boys and Filth are challenged to build the mightiest missile launcher.
A trio of young Suffolk mechanics compete against three teachers from Wolverhampton to build a wind-powered coffee bean mill.
Two teams have 10 hours to build a submarine.
A machine capable of demolishing bits of a set of industrial outbuildings at an old power station in Norwich.
The final competition pits biker against biker.
Teams have to build a salvage machine which can raise a mini from the bottom of a lake and park it in a car park.
Teams must build a vehicle to travel as far as possible on one coffee cup full of petrol.
The Navy and the Bodgers are challenged to construct an amphibious vehicle out of scrap materials in one day.
The teams must build a land yacht capable of carrying the entire team.
Robert Llewellyn and Cathy Rogers host an explosive battle of ingenuity and skill as two teams are fired up to the task of building a cannon.
A group of eccentric Cambridge therapists compete with Peterborough's finest washing machine repairmen to make a flying machine and then a brave pilot from each team has to fly it.
The team must build a rocket capable of carrying a fragile payload to the greatest height possible and bring it back to Earth intact.
The Somerset Scramblers and The Rusty Regiment teams have ten hours to build powerboats out of scrap metal.
A trio of bikers from Essex challenge the Beasts of Bodmin to build off road electric cars in ten hours.
The teams have to retrieve gold from a sunken treasure ship lying in the London Aquarium.
Two teams have just ten hours to build a high-powered working tractor using only junk before the big showdown.
The teams have to build a medieval siege engine to destroy the other team's castle.
Highlighting the best and worst moments involving crazy contraptions.
The teams must build a monster-size rescue vehicle capable of retrieving a family saloon car from the middle of a treacherous off-road course.
The final episode of the series revisits the funniest, most ridiculous and memorable moments of the last series.