In the first episode of the first series the two teams must make siege engines.

In this episode the two teams must make machines capable of moving heavy weights.

This week the two teams must make diving rings from the scrap.

In this episode the two teams must make powers boats from the scrap.

In this episode the teams must build rockets from the scrap to see who's can go the highest.

In this episode the two teams must create fully functional cannons

Robert Llewellyn and co-presenter Cathy Rogers unveil a doubly hard challenge - build a car that thinks it's a boat!

The teams are asked to build a yacht, but not one for the high seas - a land yacht capable of carrying the entire team. The winners will sail through to the semi-finals.

The first of the Scrapheap Challenge semi-finals, where two teams are challenged to build a vehicle to travel as far as possible on only a cup of petrol.

The challenge is to build a salvage machine capable of raising a Mini from the bottom of a murky lake and park it safely in a car park.

The teams are challenged to make a walking machine: the winning contraption must carry the whole team and a heavy safe across a haphazard obstacle course.

The teams each have to build a machine capable of demolishing a set of industrial outbuildings at an old power station in Norwich. Sadly, no explosives are allowed, but they manage all the same. The Beach Boys, a group of twentysomething surfers, decide on a straightforward, human-powered battering ram, and do something no other team has ever managed — they finish building before time is up. The Chaos Crew keeps the Junkyard Wars tradition alive, with a great, big, nasty-looking machine. They build a big hydraulic claw that can rip down walls.

Teams must build a nonpiloted flying vehicle that can accurately drop paint bombs on a target on the ground. Both teams need to go with radio-controlled vehicles, but that's where the similarities end. Three Revs a Minute are three trainee ministers (Get it? Revs?) who decide to build a working model airplane. Their opponents, The Mothers of Invention, go for a big blimp made of Mylar. The challenge begins at 3 a.m., since both teams want to avoid any wind.

In this challenge, The N.E.R.D.S. (New England Rubbish Deconstruction Society) — the first American team to compete in the show — take on The Dipsticks, three undersea-oil-drilling platform engineers. The task of the day turns out to be a minisubmarine, which can pull two scuba-clad divers around an underwater obstacle course. The Dipsticks create an elaborate vehicle to ride in. The N.E.R.D.S. stick to their KISS (Keep It Simple Stupid) philosophy and build a James-Bond-style diver tow, a submersible engine and a propeller, which pulls the divers behind it.

The Techno-Teachers go up against The Manic Mechanics to see who can harness the forces of Mother Nature and build a windmill to power a machine crucial to life as we know it — a coffee grinder! One team constructs a conventional fan-bladed windmill, while their opponents go for a vertical-axis Savonious rotor. Quick on-screen sketches reveal which is best for which wind conditions. But a half-hour before the competition, the weather services release a gale warning, forcing one team to clip the blades off their windmill for fear of having them ripped off. But at competition time, the wind doesn't get over 2 miles per hour.

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.

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.

There's an acre of wheat to cut and collect. This semifinal Junkyard challenge sends the competitors down to the farm to see who can build the best mower. One team turns a taxicab into a take-no-prisoners lawnmower, while their opponents turn a pickup truck into a harvester. Amid lots of smoke and chugging, both teams' machines "buy the farm." The winning machine is an impromptu scythe made out of a foot of metal.

In the second semifinal match, the challenge is to make a vehicle that drives on steam power. One team finds a weird little three-wheeled car and adds a steam engine, their opponents decide to build a dragster. But don't think that these machines will be on the roads anytime soon. A broken drive shaft on one car has to be welded back together mid-race, while the other car has no brakes, and must be thrown into reverse to make it up hills.

In the championship match, the two surviving teams see who can build a boat that will go across a lake and put out a fire in a burning building. One team builds a Land-Rover-based fireboat with an amazing pump, but their boat is less maneuverable than they'd like. The other team's pump is not as strong, and their boat keeps taking on water.

Drag racing. Nothing gets a Junkyard Warrior's blood stirring like sheer speed. In this special match-up, the Season 3 champs go up against last year's winner to see who can go as fast as possible while staying on the ground. The champs go for a classic dragster car, but when their gearbox blows up, they have to flip the back axle upside down, making reverse gear push the car forward. Last year's winners go for a trike, which increases the possible speed, but takes much more precision to build.

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The new series kicks off with our barmiest challenge yet: to build a machine that will fire an ostrich egg as far as possible and bring it back to earth in one piece. The machines must be mobile so that - if the eggs survive intact - they can be wheeled to the landing spot for another attempt. Each team is given three eggs and the winner is whoever has travelled the furthest after three shots.

The challenge for the second heat is to build a 'monster truck' and drive it around an 'S'-shaped course in a dirt oval. The trucks will have to climb dirt hillocks and crush a line of cars before accelerating home. Each team is allowed three runs: the winner is the one that sets the fastest time.

This week's challenge is to torpedo the opposition. Each team must build re-usable torpedoes that run just under the surface of the water, like the torpedoes used to attack boats (rather than those used to attack another submarine). The teams then have to try and hit wooden 'battleships' in front of each other's launch platforms, taking it in turn to fire. The platforms are 150 feet apart, and there's a rock in the middle which they have to steer their torpedoes around. They will have to hit each other's battleship three times. In the event of both teams being on target with their first two shots, the third and final shot will be a simultaneous shoot-out.