It's a race to see who will clean up for a chance at the semi-finals between The Cat-alysts and Scrapheap veterans the Chaos Crew. Each team will have to build a machien that will clean up the most debris strewn over a parking lot. All four team-members must stay on the vehicle, only getting off to empty their garbage hopper or to fix their machine. They will only have 30 minutes to collect as much of the garbage as they can while avoiding obstacles in the litter field. The team whose garbage bag(s) weigh the most, is the winner.

The Cat-alysts are going to try and suck as much as possible at this contest. They plan on building a giant vacuum on the back of a van. The most crucial piece of their machine will be the fan that provides the suction. It will have to be powerful enough to suck up debris and also be rugged enough to handle heavy bits too. If the fan breaks during the clean-up time, it could be a lop-sided victory for the other team.

The Chaos Crew, who lived up to their name last time, are building a machine like the threshers built in Series 3. A brush will push the garbage up a conveyor belt with "flights" (pieces of wood) that will carry the garbage up a chute and into a hopper. They'll need an engine for the belt and a sturdy truck to put it all on.
 
 

The Cat-alysts l to r; Shane, Captain Garry & Tim inset; Expert Martin Bremner	The Chaos Crew l to r; John, Captain Andy & Spike inset; Expert Mike Hasler
The Cat-alysts heavy hoover	The Chaos Crews Sweep-o-matic
Tim needed to drive through the opposing teams work area	This van will be the basis of the Cat-alysts design
The Scrapheap standard Land Rover works for the Chaos Crew...	...as will this old conveyor belt
This is the easy way to put a window in a van	Unfortunately, the Chaos Crew's Landy has a leaky gas tank, spilling 5 gallons of gas on the ground
The only way to fix a leaking gas tank is to cut it out!	Judge Rodger Hoadley
The Chaos Crew go through 6 batteries before finding a good one	The Cat-alysts take a 5 minute break to square things away
Not being able to find a proper fan, they merely make their own	To save on a 2nd engine, the Chaos Crew will hook this axle to the rear drive of their 4 wheel drive vehicle
This fan has to work for the team to have a chance at winning.	The Chaos Crew attach the flights to the belt so it will carry the garbage up

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