1. Episode 1

In this episode, Michael meets tremors-sufferer Thomas who is about to undergo pioneering brain surgery, and Allen, who finds out if his experimental cancer treatment has been a success.

3. Episode 3

The presenter meets a community group in Glasgow, and reveals the best way to keep our brains young as we age. At Royal Papworth Hospital, cameras follow a life-saving procedure to treat Clifford, who has developed dangerous blood clots in his lungs. And a woman shares the secret of how she is long-distance running well into her seventies.