Diagnosis: Unknown - Season 1

Medicine is a battle that is fought every day, in every corner of America, and all around the world. It is a fight against the ultimate villain, death, and it is waged heroically by men and women who live their lives by one profound oath: "I will do no harm."

Who are these people, who each day balance selflessness and power, detachment and humanity, brilliance and fallibility? Who are their patients, who come to them vulnerable, bleeding, broken? What does it take to make things right... and what are the repercussions of those critical decisions?

Diagnosis: Unknown is a scripted reality series featuring the best doctors and scientists in the world. From cardiac surgeons on the front lines of heart surgery, to epidemiologists struggling to root out the cause of a deadly epidemic, you'll see the world of medicine as you've never seen it before. Discover how strange and rare diseases are identified on the brink of global outbreak. Experience the tension of crucial, but experimental surgery. See state-of-the-art procedures that are changing lives forever.

Each one-hour episode of Diagnosis: Unknown will focus on one case, one person, and the dedicated team of medical professionals who struggle from crisis to attempted cure. As with any story about medicine, there is always a larger issue. Public health policy reaches into each of our homes, regardless of race, gender or economic status. The failure of one parent to vaccinate a child can lead to disaster. The under-funding of rare disease research can result in thousands of needless deaths. The controversy generated by conflicting medical opinions can leave patients frustrated, angry and worse. Behind every case there is a story, and behind every story is a medical issue that could affect us all.

Part science, part mystery and wholly human, Diagnosis: Unknown is about people and risks... triumphs and failure. This is a world ruled by time and consequence. Every decision matters... and every second counts.

Diagnosis: Unknown: The extraordinary stories of doctors, patients and the fight to survive.