Reacher Season 2 has been one of the best television series of recent times, and with only two episodes left to stream on Prime Video, leading up to a tense finale on January 19, it's going to be a showdown of epic proportions. Alan Ritchson is the muscle-bound hero, Jack Reacher, but the real strength of season 2 is in the very good ensemble cast of characters from his former unit in the military. Shaun Sipos joined the cast as a series regular in season 2, playing David O'Donnell.