High Quality Content by WIKIPEDIA articles! Mercy is a medical drama which originally aired on NBC from September 23, 2009 to May 12, 2010. The show focuses on the lives of three nurses – Veronica, who has recently completed a tour of Iraq and has some emotional issues; Sonia, Veronica`s best friend who has become seriously involved with a police officer; and Chloe, a recent graduate who is thrown into the world of nursing and is unprepared for what it entails.