Mercy is an American medical drama television series created by Liz Heldens, which aired on NBC from September 23, 2009, to May 12, 2010. The series initially aired on Wednesday at 8:00 pm (ET), as part of the 2009 fall season, but was pushed back to 9:00 pm in April. On October 23, 2009, Mercy was picked up for a full 22-episode first season. On May 14, 2010, NBC cancelled the series after one season.