Tonight and tomorrow night, CNN presents two more specials from chief medical correspondent Dr. Sanjay Gupta. Tonight, Gupta interviews actor and philanthropist Michael J. Fox about his experience with Parkinson’s disease and his foundation’s decision to fund a five-year, clinical study to identify the disease’s progression. A Conversation With Michael J. Fox airs tonight at at 8pmET on CNN.

Then tomorrow night at 8:00, a second special, Doctor Detectives, will debut. Taking a page from FOX’s House,  Gupta profiles Dr. William Gahl, director of the Undiagnosed Diseases Division of the National Institutes of Health (NIH) as he and his team diagnose and treat conditions that medical science does not yet understand.