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.
Cast of this episode
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