As the second episode of the season, "One Night in October" was a pretty solid episode. It was definitely a difference after last week's action-y season premiere, but people who don't appreciate episodes like this one probably shouldn't even be watching Fringe. Fringe isn't about action and shapeshifters…it all breaks down into simple themes like "Who are we?" and "How does this affect the ones I love?"
The latter has certainly been played with this season, as we've been discovering how our favorite characters are like in a world without Peter. But the first one was used primarily tonight, as John McLennan finds out a serial killer he's tracking is actually himself in another universe. (Though I must say that the idea of on one side, he's a serial killer, and on the other side he's a professor that studies serial killers seems a little too convenient.) But what would happen when he finds out that "he" is the one who has been killing these people? That's the idea we explore in this episode.
This episode also had a Mystery-Of-The-Week feel to it, but considering its pretty much a standalone episode, I thought it was extremely well done. Excellent writing, great direction by Brad Anderson, and like always on Fringe, wonderful acting was seen in this episode.