Have you ever wondered what it would be like to have a heart transplant? Would you still be the same person as before or would you become more like the donor that gave you your new heart? For My Donor follows one patients journey to understand if they have taken on any of the characteristics of their organ donor, and to finally meet the family that gave the 'gift of life'. Over the course of a year, Mark investigates some of the stories that seem to suggest that transplanted organs can really store memories, a theory called 'cellular memory'. Slowly becoming more and more obsessed by his own donor, life starts to become more of a struggle until the final, emotional meeting with a family is played out. Does 'cellular memory' really exist and what does it mean for organ transplantation? For My Donor reveals all.