Martin, 76, suffers a catastrophic heart attack behind the wheel.

Medics act quickly to get David ready for surgery after his vehicle collided with a tractor. Trauma and plastic surgery teams attend to Rodger after his paramotor crashed into the ground at speed.

Rich, 17, goes flying after hitting a roadblock on his mountain bike. Can surgeons do enough to ensure he doesn't sustain lasting brain injury due to his open skull fracture?

In this edition, 20-year-old Jess is critically injured when the car she's driving collides with another vehicle, flips and lands on its roof