Two time travelers, Cole and Cassie, must journey throughout time to prevent the Army of the 12 Monkeys from destroying all reality.
It's the beginning of the end. The 4th and final season if 12 Monkeys arrives in 2018.
Catch Up On Past Seasons
With the identity of the Witness - the engineer of the reality ending Army of the 12 Monkeys - now known, Cole and his allies must travel through different eras in history to stop him.