Overview: Guy Martin loves pushing the boundaries of speed in search of a buzz. He claims that nothing can match the adrenaline rush he gets when he's racing on public roads around the Isle of Man TT course at 200mph. Now he wants to see if he can find anything that can give him the same kick. In this series, he creates four-speed based challenges, exploring the boundaries of physics, learning about the science of speed, and getting his hands dirty in a range of unique engineering projects.