Budding chocolatiers compete for the chance to make their own chocolate bar that will be manufactured and sold by one of the biggest chocolate companies in the world. This time, the contestants are challenged to make a supersize bar and bite-sized pieces with lots of texture, as well as getting to make use of some of the latest chocolate-making gadgets - which do not always work as intended, leading to some unexpected meltdowns. The Hairy Bikers Dave and Si also visit a top-secret sensory laboratory where products are tested for taste.