Jamal punishes his opposers. Meanwhile, Barry's relationship with Molly is tested.
Barry plans a coup to remove his brother from office.
Amira reveals a 20-year-old secret, causing Barry to see his father in a new light.
Barry convinces Jamal to meet with an exiled opposition leader.
While Jamal prepares to have the military clear a Plaza of protesters, Barry rushes into a meeting with an exiled enemy of the state in hopes to avoid a dangerous situation.
Barry attempts to keep the peace in Abuddin as the 20th anniversary of his father's chemical attack looms. Jamal must deal with the repercussions of the assassination attempt on his life.
New evidence is discovered in connection to the attempted murder of Jamal.
Audrey pursues diplomatic channels to try to prevent a full-scale war. Meanwhile, Jack Bauer leads Kate Morgan and Mark Boudreau on a mission to locate their target before it's too late and the world is changed forever.moreless
Barry delays his return to America when his brother is incapacitated. Later, Barry's nephew's wife is kidnapped by terrorists.
Tensions between President Heller and Prime Minister Davies boil over, until one of them decides to take matters into his own hands. Meanwhile, Jack has a plan for tracking down Margot, but it involves using someone unexpected—and unsuspecting—as bait; and back at the CIA in London, Jordan raises suspicions about Kate's husband.moreless
Jack suspects that Abigail helped her father in his serial killings. Even though Alana is against it, Hannibal escorts Abigail back to Minnesota. Things get worse when a copycat killer murders Abigail's friend. Hannibal suggests they hide a body but secrets carry a price.moreless
The fate of humanity is on the line as Walter plans to make the ultimate sacrifice to stop the Observers before they were ever created.
To penetrate the Observers' headquarters and rescue Michael, their only hope for victory, Olivia must use her abilities and meet with some old friends.
While Walter tries to learn more about the mysterious Donald after Michael's revelation, Windmark undertakes his own quest for knowledge.
The team joins forces with Nina to recover a key piece of the plan that Walter created to defeat the Observers.
While Olivia and a recently-recovered Peter investigate a mysterious signal coming from a forest, Walter uses LSD to try and recall his memories of his plan to defeat the Observers.
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.
The fight against the Observers intensifies and a Fringe team member plans an attack on his own.
The Fringe team investigates a pocket reality occupying an apartment building, and Peter learns that he has the power to stop the Observers.
Peter takes extreme measures when the team learns of a way to stop the Observers from changing Earth's atmosphere and wiping out humanity.
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.
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 Walter's mind is damaged by Windmark's telepathic probe, the team goes to Walter's old Harvard lab to find the information they need to defeat the Observers.
In the year 2036, Peter, Astrid, Walter, and Etta set out to find Olivia and free her from amber. Once they do, they discover she holds the key to finding the plans for a weapon to defeat the Observers... but Walter is captured and interrogated for the same information.moreless
The Fringe team is pushed to the brink as they try to save every living person from the schemes of Jones' superior.
Walter is forced to relive his past while investigating a series of spontaneous human combustions, while David Robert Jones begins his end game.
The Fringe team on both sides fight a common cause and developments are made regarding the Cortexiphan children.