In this episode, the fixers take on three more challenges to change lives, including one of their toughest yet when they try to help a young boy with Tourette's to control his tics and behavioural issues. Eleven-year-old Malachi lives with his mum and younger brother in Cornwall. Malachi has Tourette's Syndrome, a neurological condition characterised by involuntary movements and noises called tics. He also has Attention Deficit Hyperactivity Disorder and struggles with disruptive urges and violent outbursts. At school, he needs three support workers with him at all times. As Malachi gets older, his behaviour is increasingly difficult for mum Marie to manage, and she is increasingly worried that if he doesn't find a way to control himself, he will end up in serious trouble. Electronics engineer Ryan White teams up with Zoe Laughlin, an expert in materials, to explore what they can do. But their first encounter with Malachi leaves them concerned that they may have taken on more than they can manage. Knowing more about the condition could help them work out what to do, so their next stop is Great Ormond Street Hospital in London to meet one of the world's leading experts in the field, Dr Tara Murphy. Four-year-old Jasper suffered complications after contracting hand, foot and mouth disease when he was one years old. He had a heart attack and a stroke in his spine which left him paralysed from the waist down. His parents have sought the best medical help they can get for their son, in the hope that he will one day be able to walk again, but so far he has only gained enough strength to be able to crawl. They are hoping that the team can come up with an invention that will enable Jasper to be upright and moving his legs, so that he can work on building the strength in his muscles and get used to being in a standing position. Technologist and designer Haiyan Jang takes up the challenge and enlists the help of inventor and engineer Yusuf Mohammed to help search for a