The series is about agents from a secret unit in Los Angeles. The main characters are Callen - an agent with the past, his partner Sam Hanna - an expert on the Middle East and a former commando. Agent Kensi Blye and her partner Dominic Vaile are always happy to help Callen and Sam, the whole unit is headed by Hetty Lange. The premiere of the series took place on 22 September 2009.
List of 5 series that you must to watch and read the information about them.