"Tracker" debuted on CBS in the 2024 TV schedule not only as Justin Hartley's return to primetime as a series regular after "This Is Us," but the show that would land the coveted post-Super Bowl time slot. The series rose to become television's #1 show for the 2023-2024 TV season and guaranteed that Hartley could continue playing Colter Shaw at least into a second season. The star was also able to recruit some standout guest stars, and he spoke with CinemaBlend about arguably the most highly-anticipated of Season 1: Jensen Ackles.

Jensen Ackles starred on "Supernatural" for fifteen seasons before moving onto roles on shows including "The Boys" and "Big Sky." Justin Hartley and Ackles are both veterans of The CW and longtime friends, so it only seemed natural that he would play Russell Shaw, Colter's brother. The episode that reunited the Shaw brothers also included some fun "Supernatural" Easter eggs.