(S01E16) It has come down to this. Number 6's captors have failed in every attempt to get him to tell them why he resigned. Since this is the second to last episode in the series, something has to give.

It doesn't take long to realize that this episode is going to be an interesting one because Leo McKern returns as Number 2. In my opinion, he is the best Number 2 because he just seems so comfortable in the role. As he returns, we can see that he is not happy to be there. It appears that he has been brought back to ascertain Number 6's reason for his resignation. Upon looking at Number 6's actions on the video screen, he asks angrily, "Why do you care?"