It's actually a pretty interesting concept: a timeline checkpoint at July 1 each year that can be reset to if the world gets destroyed but the team has to try to foil the threat to avoid the reset, which itself has serious ramifications. Team members are special in that they remember the discarded time period. The action scenes are pretty well done but a better time-travel series is Bodies and an infuriating one is Dark.

If you haven't seen "Travelers" it's fantastic!