Timeless is an American science fiction television series that premiered on NBC on October 3, 2016. It stars Abigail Spencer, Matt Lanter, and Malcolm Barrett as a team that attempts to stop a mysterious organization from changing the course of history through time travel. The series was created by Shawn Ryan and Eric Kripke, and also stars Sakina Jaffrey, Paterson Joseph, Claudia Doumit, and Goran Višnjić. The executive producers include John Davis and John Fox of The Blacklist.

Although NBC canceled the series after one season, the series was renewed three days later following negotiations with Sony Pictures Television. The ten-episode second season premiered on March 11, 2018, and ran until NBC canceled the series again in June 2018. One month later, NBC ordered a two-part finale to conclude the series, which aired on December 20, 2018.

When Eastern European-based ex-National Security Agency asset turned terrorist Garcia Flynn and his group of terrorists steal an experimental time machine, Lucy Preston, a history professor, Wyatt Logan, a United States Army Delta Force Master Sergeant and Rufus Carlin, an engineer and programmer, are tasked with capturing Flynn. They soon learn that Flynn plans to rewrite history and that each of them has a connection to his plan as well as the mysterious organization known as Rittenhouse that funded the machine's development.

[ source: Wikipedia ]