A rising employee of Massive Dynamic is attacked by killer butterflies, which disappear after they attack him. Cue Fringe science. After investigating and coming up empty handed, Olivia is shown a underground warehouse by none other than her dead partner, John Scott. Through this connection to John's memories, Olivia is able to track down another potential target. They are able to capture him before he is able to leave the country, but he is killed in the same way as the other employee when he offers information linking Massive Dynamic to other pattern events.
And our friend the Observer? He comes into our story right at the beginning, and is easy to see. At the beginning when the Massive employee exits the elevator, a friend begins to lead him to the conference room. At this point he can be seen on the wall behind them, with no other people around so it is easier to see him. Even so, I have highlighted him for your benefit, for those of you who can't decipher which of the three people he is (and for those of you who can't, you might want to find another way to spend your time because this just isn't working out. its not me, its you). Enjoy!