Scrapheap Challenge is an engineering game show prouced by RDF Media and broadcast on Channel 4 in the UK. In the show, teams of contestants have 10 hours, in which to build a working machine that can do a specific task, using materials available in a scrapheap. The format has been exported to the United States, where it was known as Junkyard Wars. (The US show was also produced by RDF Media, and was shown on The Learning Channel, for a period of time, but is now shown on The Science Channel.) The UK version of the show is also exported to Australia, and is shown on ABC1 and ABC2.