Now THAT was a fantastic episode!! I knew instinctively that once Nina returned here to help the gang and the boy that her time on the show was coming to a close. I also knew that she would be "interrogated" by Windmark and that the only way out, the only way to save the gang would be to end her own life so that she couldn't be read and give away their position. None of this was a surprise. But she did have a great final scene where she basically points out the flaws of the Observers about them being animals. It was great. Even though Windmark didn't show any outright emotion to her revelation, you could tell that he was insulted...because he knew her to be 100% correct.

The big reveal comes at the end when we find out who 'Donald' is. It's none other than September. I had thought of this twist back when it was first mentioned there was a 'Donald', but I never went any further than this. But that didn't keep me from wondering if we would see September one last time before the series ends. It's safe to say, yeah, we will. Very cool.