The first season of The Mentalist premiered on September 23, 2008 and concluded on May 19, 2009. It consisted of 23 episodes.
The second season of The Mentalist premiered on September 24, 2009 and concluded in May 2010. It consists of 23 episodes. CBS moved the show from Tuesdays at 9/8c to Thursdays at 10/9c, after CSI: Crime Scene Investigation. The second season of The Mentalist premiered in the United Kingdom on FIVE on Friday February 19, 2010 at 9pm.[1]
The third season of The Mentalist premiered on September 23, 2010.
On May 18, 2011, CBS announced that The Mentalist had been renewed for a 4th season.
