Michael J. Fox, the former star of ABC's comedy hit Spin City, makes an emotional return to the network as the acclaimed television and movie star investigates the nature of optimism. In 1998 Fox publicly revealed that he had been diagnosed with early onset Parkinson's disease and, two years later, made the difficult decision to walk away from a highly successful acting career with credits including the top-rated NBC comedy series Family Ties and the blockbuster Back to the Future movies. His triumphant spirit and positive attitude, considering his daily fight against the symptoms of a complex and incurable neurological syndrome, may make you wonder: How does he remain an "incurable optimist"?