'''''Scrapheap Challenge''''' iswas a British television show where teams of contestants build a working machine that can perform a specific task, using materials available in a [[Wrecking yard|scrapyard]]. The series features teams of four or five members who are given ten hours (based around sunset) to build vehicles or machines to complete a specific task, such as a [[trebuchet]], or complete a racecourse whilst acting as a [[gyroscope]]. The programme ran for eleven series and was originally shown on [[Channel 4]]. The format was exported to the United States, where it was known as '''''Junkyard Wars'''''. The American show was also produced by RDF Media, and was originally shown on [[TLC (TV channel)|The Learning Channel]]. Repeats have aired on another Discovery network, the [[Science (TV channel)|Science Channel]].