These last few episodes of Fringe have been really intense. Who expected Etta to die after only four episodes? In the aftermath of her death we see peter an Olivia drifting apart as they each deal with the pain which comes from the loss of a child.
No matter how bad your week may have been, Fringe Friday always makes it better. This intense episode sees the Fringe team causing some mayhem for the observers.
Choices and the consequences thereof are central themes in Fringe. This episode beautify demonstrates the consequences of the choices we make. In one universe a man is a college professor, in the other universe his double is serial killer. The man has the same inner demons in both universes but a single choice (to run or not to run away from his father) gave of one them the tools to step outside of his own psychosis and live a productive life.