NCIS: Los Angeles - Lockup

Whoa.  NCIS:Los Angeles sure knows how to do a great episode.  Sam gets a call about Moe, his 'adopted' brother who is now in prison.  He has been attacked by a group who are associated with terrorists.  Sam finds out that he is trying to join the terrorist group on behalf of NCIS.  When Sam investigates, he discovers Nate is working undercover in the prison and is working with Moe.  Yea, Nate is back!  Well for one or two episodes, which is a real shame because I liked his character.  It would have been better to keep him than get in Nell, but there is probably a reason for it somewhere.
Anyway, Sam wants to protect Moe and help infiltrate the group so he goes in to prison as an inmate and is eventually offered a chance to join but he is breaking out, with the help of the rest of the team, so that not only can he get Moe out but also the terrorist leader and then they can follow him using the 'Overwatch' spray from a previous episode.
##SPOILER ALERT!## - They escape but the leader knows someone is a traitor and tortures Moe to find out who.  Moe tells him it is his right hand man, so the terrorist leader kills him, but not before killing Moe.  Sam wants to kill the leader, but Hetty appears and stops him.  She tells him, he will get his chance for revenge.
A really great episode with death of a minor recurring character and the return of the old series regular Nate.  Can't wait to see Sam catch up with the terrorist leader.