NCIS: Los Angeles - Plan B

We get to see some background on Deeks this episode when a former friend and informer is being seriously threatened by a violent crime gang and Deeks must go undercover, using reactivating an old alias.  What we come to see is that it is more than an alias, but an entire character, and one that Deeks is not proud of.  He acts differently, dangerously.  You see, Deeks had a 'thing' with his friend's wife and Deeks' 'relationship' with Kensi keeps getting highlighted in this episode as well.
To finish this episode off there are some amazingly explosive stunts.  Can Deeks save his friend or has everything he has been working for been for nothing?
A brilliant episode that is leading into the two part season finale.  Love this show!