(S01E06) Despite their best efforts so far, the powers-that-be at the Village can't seem to break Number 6 and ascertain the reason as to why he resigned from being a spy. In this instance, the new Number 2 gets a call from (presumably) Number 1 who implores him to get information from Number 6. We see a clearly agitated Number 2 acknowledge to his boss that he "is not indispensable", so it would be safe to assume that more drastic measures will be taken to get Number 6 to talk.
We are then introduced to Number 14, an attractive female doctor who has developed a means to get Number 6 to talk via the combination of mind-altering drugs and dream analysis. In other words, Number 6 is knocked out and then placed on a table with electrodes hooked up to his head and the doctor administers a shot whereby we see his dreams on a television screen. Number 2 hopes that he can get the answer he is looking for so he can get Number 1 off his back.