Wallace and Gromit's World of Invention Episode 6 - From A to B Episode Title:From A to B.Episode Description:Wallace and Gromit explore incredible transportation inventions from around the globe. In the 'Contraption Countdown' the focus is on peculiar transport devices, and the duo find out how to cross the River Thames in a plastic bag. They discover the intention behind laser propulsion in the creation of flying saucer technology, and meet Cedric Lynch, an illustrious engineer who invented electric tricycles. Wallace also invents a runabout steam chair to get around, but it overheats in the end and falls apart. Wallace though doesn't let it go to waste and repurposes it as a dual water boiler and oven.