Season 4
In Season 4, James Cole and Dr. Cassandra Railly set out on an epic quest, traveling further back in time than they have ever been before. According to legend, their only hope lies with a weapon capable of stopping the Witness for good. But they'll soon discover that in order to win the final battle and save time itself, they will have to make the ultimate sacrifice.
Episodes
The End
The final conflict with the Army of the 12 Monkeys begins when the Witness returns to Project Splinter.
Ouroboros
Travelers come face to face with ghosts from their past when they find themselves maneuvering around their own timelines.
45 RPM
Cassie travels back in time to confront a younger Olivia; Cole helps Jennifer find the meaning behind her final Primary vision.
Legacy
Team Splinter goes back in time to the wild, wild frontier in search of a weapon to destroy the Witness.
After
A clue to breaking the cycle leads Cole and Cassie to the 1960s. Christopher Lloyd returns as Zalmon Shaw, a devoted follower of the Witness.
Die Glocke
The team infiltrates a Nazi gala to steal an artifact known as 'Die Glocke'. Their operation comes undone when French Resistance interferes and an unexpected guest arrives.
Daughters
Jones sends Hannah back in time to 2007 on a personal mission that could be the key to everything.
Demons
Everything changes when the team finally climbs the steps... and rings the bell in the Middle Ages.
One Minute More
The beginning of the end as Cole and Cassie embark on their final mission.
The Beginning (1)
The final battle against the Witness as the fate of time and mankind hangs in the balance. All the pieces finally come together to mark the end of the beginning.
The Beginning (2)
When all hope is lost, Cole must complete his cycle so that his younger self will one day arrive at the end with the answer.