Dr Christian revisits two women who have gone to extreme measures to dramatically change their bodies. Their very different personal stories provide an insight into what it means to change sex.
The programme follows the women's journeys and the lengths they've gone to in order to achieve their goal - from stories of love and bullying to butchery abroad and eye-watering surgery.
Over a year later the programme catches up with them to see how life has changed since being in the clinic.
