Miles leads the gang out of Philadelphia to escape the attack helicopters which are patrolling the area. Miles and Nora become closer and Rachel tries to ease her guilt by supplying power to the rebels.moreless
Peter reaps the consequences of spying on an Observer leader. Meanwhile Olivia's search for another tape leads her to a woman who seems to be able to divine the future.
In the mid-season finale, Miles and Monroe finally come face to face and Charlie encounters someone unexpected.
To aid her rebel buddies, Nora enlists the help of Miles to infiltrate Monroe's base and assassinate him. Rachel continues work on a machine to amplify the mysterious pendants.
The fight against the Observers intensifies and a Fringe team member plans an attack on his own.
A ruthless tracker is sent after Miles, and Nora has to make a difficult decision regarding a family member.
The Fringe team investigates a pocket reality occupying an apartment building, and Peter learns that he has the power to stop the Observers.
The gang stumble across a group of kids fending for themselves and Rachel reveals the real reason she deserted her family.
Peter takes extreme measures when the team learns of a way to stop the Observers from changing Earth's atmosphere and wiping out humanity.
The gang search for medical supplies for Nora. They come to a large house occupied by a gang. The leader, Drexel, knows and isn't too fond of Miles. Drexel then threatens Charlie into infiltrating and killing the leader of a local settlement who has been burning their opium poppy fields. Neville delivers Danny to Monroe.moreless
After infiltrating a subway station to recover a vital piece of Walter's plan, the Fringe team meet up with an old friend... and must determine if he can be trusted.
After orders from Monroe, Danny becomes more valuable, increasing his safety. The group experience more problems finding him, however.
The Fringe team meets with a group of humans who have taken refuge in the forest and seek to preserve humanity's history any way they can.
After successfully rescuing Miles from the militia, Charlie and Nora head off to meet up with Maggie and Aaron, with Nate on their trail every step of the way.