6. The Observers
Appearing in all 100 episodes of Fringe, the Observers have been a looming presence right from the start. Eating only the spiciest of food these strange people from the future originally avoided influencing the timeline until the time had come to invade, and invade they did. Using portals from the future they have begun transforming the worlds atmosphere to sustain themselves more effectively. We have learnt loads more about the Observers in the current season, but theres so much still to be answered about them. Its eerie watching the older episodes again now theyve been confirmed as being the enemy, some parts take on a much more sinister twist with that knowledge.
The Questions: How did they become who they are? What is their ultimate agenda? Where are the females? How much of everything we saw during the 5 seasons was directly attributable to them? Is there anyone senior to Captain Windmark?