Steve Jones presents as motorcycle racer and mechanic Guy Martin attempts to build the world's largest Wall of Death, taking on a stunt that involves riding a motorbike around a vertical wall at high speed. In an programme originally broadcast live, Guy will attempt to go faster and further than ever before, scaling new heights on an enormous wall that has been specially constructed from shipping containers. The programme also shows his training under Ken Fox, as well as looking at the science involved and highlighting the massive G forces he'll need to contend with