Project Splinter is about to begin. Will the future be erased by changing the past?

Is Project Splinter a failure or a success?

27 years after a virus wipes out most of humanity, scientists send a man back to 2015 to stop the plague from ever happening. Cole's only lead is a virologist, who knows the dangerous source of the outbreak.

The trail of a mysterious organization called the “Army of the 12 Monkeys” leads Cole to a mental institution in 2015, where a patient holds the key to the plague that destroys the world. Meanwhile, despite warnings that her involvement may disrupt the course of history, Dr. Railly risks her life to help him.

Jennifer Goines and the number 12 are a bad combination.

Is everyone in danger - from something other than the virus?

Cole's search for the location of the virus leads him to 2014, and to a devastating moment in Dr. Railly's life involving a dangerous outbreak in Haiti.

That's all it takes before we are out of time.

A fight for the future ensues when a dangerous band of marauders hunting for Cole and Ramse threatens the mission to save the past.

Something with the timeline is wrong. Very wrong.

Cole and Dr. Railly face off with the Army of the 12 Monkeys when both discover the Night Room –- an off-site, black ops lab that houses the virus that will one day destroy the world.

The past may hold the key to the future.

When the tragic events of the Night Room create an alternate reality in 2043, Cole risks his future.

What’s the best way to celebrate the end of existence?

Cole, Dr. Railly and Aaron strive to stop the virus from being deployed as a bioweapon in Chechnya.

The future of the mission - really, the future of the future - is up in the air.

The Core that powers the time machine is fading. To get Cole back from the past, Jones must convince her former colleagues at the military operation "Spearhead" that her mission is worth saving.

A team member leaves a last message.

Cole finds himself in 2017 at the height of the plague. Out of options, Jones faces an impossible choice to replace the Core.

Leland Goines has an empire to protect.

Forces come to a head when Ramse does what it takes to protect his newfound family, leaving Cole to deal with the aftermath.

When time is broken, it just needs a little help.

Cole splinters to Tokyo, 1987 in a last chance effort to stop the Army of the 12 Monkeys.

Jennifer Goines interviews a potential assistant. Guess how that goes.

With Cole dying from the effects of time-travel, Railly must find the one person who can save him.

The old Markridge is dead. Long live Jennifer Goines.

Cole and Railly attempt a final confrontation with their closest enemies, while Jones faces a new threat to all that she's accomplished.

Jennifer Goines has a few things to say about the end of the world. But what’s truth, and what’s her crazy?

Flash forward later in Season 2: Why is Dr. Jones all alone? Where did everyone go?

The Witness brings salvation, or destruction. It’s all a matter of perspective – and time.

Cole and Ramse repair their broken friendship while on the run; Railly and Jones navigate an uncertain future in 2043.

Cole gets stranded in 2016 after an attempt to destroy the virus changes the future. Jones and Railly deal with the consequences of the changed timeline.

Despite the growing tension between them, Cole and Cassie time travel to New York during World War II to track down a dangerous member of the Twelve.

When Cole and Cassie are stranded in 1944, Jones must turn to the person she trusts the least to bring them home -- Ramse. For Ramse, this mission will give him a chance to atone for his sins -- but can he mend the broken relations between Cole and Railly? Meanwhile, Jones visits Old Jennifer Goines to explore the true nature of Time - and the Twelve’s method to destroy it.

In the present, Cassie and Jennifer Goines run from the 12 Monkeys; in 2044, Cole and Ramse face off against Deacon.

Cole and Ramse travel to 1970s New York City to prevent the Twelve from murdering a Vietnam veteran with a connection to the Witness.

Cole faces the Witness as Cassie's hallucinations evolve; deadly visitors from the past arrive when the time machine malfunctions and begins tearing apart time and space.

Jones comes to the disheartening realization that time travel is humanity's true enemy and that as its architect she needs to be stopped, and so she sends Railly back to the year 2020 with orders to undo all of it.

To save the last Primary, Cole must turn to a mortal enemy. Plus: Jennifer Goines, radical revolutionary?

Cole has his loyalty tested when Ramse and Railly go rogue, embarking on an unsanctioned mission that sends them to 1961 East Berlin. Once there, they have murder on their minds as they search for an unscrupulous German doctor who knows the location of "The Witness."

With the temporal facility on the verge of destruction, Cole and Jones find themselves in the middle of a coup. After a violent encounter ends in an unexpected tragedy, Cole is sent back to 1957 in a last-ditch effort to save humanity while the rest embark on a caravan across the apocalypse to find Titan -- the stronghold of the Witness.

Cole and Railly attempt to stop the final paradox in the past while Ramse, Jennifer and Deacon struggle to survive the apocalypse in a last ditch effort to find the Witness.

Cole and Railly have finally found peace living in the past. When a mysterious woman with apocalyptic visions of the future tells Cole it's not over, he must do the unthinkable to save the world... and the woman he loves.

In the apocalypse of 2163, a desperate Cole searches for Titan. Meanwhile, a captive Railly is faced with an impossible choice as the 12 Monkeys await the arrival of The Witness.

While searching for Jennifer Goines in post-WWI France, Cole and Jones encounter a dangerous group of time- travelers - the Guardians.

Bonds of trust are tested when Ramse returns to the facility with an old enemy held captive. How far will Cole and Jones go for the answers they need?

Ramse and Cole splinter to 2007 expecting either a trap - or a final chance to kill The Witness. But when Cole discovers a heartbreaking truth, he’ll discover that the mission was both.

Out of time and in need of answers, Jennifer and Deacon are sent to 1989 to steal the a sacred document. Can Railly and Cole get to the Word first before it reveals the one secret they want kept?

In 1953, Cole and Railly reunite with Agent Gale at the birth of the Army of the 12 Monkeys.

Cole and Railly find themselves at opposite ends of an unspeakable decision. Jones grows suspicious while Railly turns to an emotional ally for advice. All hell breaks loose during a massive fire-fight.

Former friends, now enemies, race to find the Witness in 1904, who, at last, reveals his face.

The reason why the Witness wants to destroy time and all reality is revealed.

The final battle with the Witness begins.

The final conflict with the Army of the 12 Monkeys begins when the Witness returns to Project Splinter.

Travelers come face to face with ghosts from their past when they find themselves maneuvering around their own timelines.

Cassie travels back in time to confront a younger Olivia; Cole helps Jennifer find the meaning behind her final Primary vision.

Team Splinter goes back in time to the wild, wild frontier in search of a weapon to destroy the Witness.

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.

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.

Jones sends Hannah back in time to 2007 on a personal mission that could be the key to everything.

Everything changes when the team finally climbs the steps... and rings the bell in the Middle Ages.

The beginning of the end as Cole and Cassie embark on their final mission.

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.

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.