10 Best Time-Loop Sci-Fi TV Episodes
5. 12 Monkeys - “Lullaby”
When Katarina Jones realizes that the true threat to humanity is time travel itself, she decides to send Cassandra Railly back to 2020 to undo it all. Cassie travels to 2020 and finds Kat in the hospital beside her daughter, Hannah's, bed. Instead of offering comfort, she points a gun at her.
Cole learns of the plot and travels to 2020 to do something about it. Meanwhile, Cassie killed Kat, but suddenly, she finds herself back where she started, and at the beginning of a time loop. The loop becomes apparent to both when they find a living Kat, so Cole shoots her to restart it.
Instead of killing Kat the next time around, they decide that saving Hannah might end the loop. The episode shoots back to 2044, and Cole is left to explain how the loop was broken. They needed to save Hannah, but Kat couldn't know she survived.
They saved the girl and took her to be raised by Jennifer Goines, which means she is alive in 2044. Mother and daughter are finally reunited at the end of an episode that really managed to get the fans right in the "feels."