12 Monkeys is an American television series on Syfy created by Terry Matalas and Travis Fickett. It is a science fiction mystery drama with a time traveling plot loosely based on the 1995 film of the same name, which was written by David and Janet Peoples and directed by Terry Gilliam, itself being inspired by Chris Marker’s 1962 short film La Jetée; the series credits both Peoples and Marker for their original works.

In the series, Aaron Stanford and Amanda Schull star as James Cole and Dr. Cassandra “Cassie” Railly in their efforts to take advantage of time travel to stop the destructive plans of the enigmatic organization “Army of the 12 Monkeys”. Kirk Acevedo and Noah Bean also star in the first season. In the second season, Bean makes a guest appearance, and Todd Stashwick, Emily Hampshire and Barbara Sukowa are promoted from recurring guests to regulars. In the fourth season, Acevedo moves from starring to recurring guest star. Stanford, Schull and Hampshire play reimagined versions of characters respectively portrayed by Bruce Willis, Madeleine Stowe and Brad Pitt in the 1995 film.

Natalie Chaidez was the showrunner of 12 Monkeys during its first season, assisting Matalas and Fickett. For the second season she stepped down to the role of consultant, and Matalas and Fickett became showrunners. In the third and fourth season Fickett became a consultant, and Matalas was the sole showrunner. The series was produced by Atlas Entertainment, which also made the 1995 film, and Universal Cable Productions. Charles Roven, producer of the original, is one of the executive producers. 12 Monkeys premiered on January 16, 2015, with a 13-episode first season.

In March 2017, the series was renewed for a fourth and final season consisting of 11 episodes, which aired over four consecutive weeks in three blocks of three hours each, with a concluding two-hour finale. The fourth season was broadcast between June 15 and July 6, 2018.