Justin Hartley's Tracker costars have often spoken about their experiences working with him before the hit CBS series lost three cast members ahead of season 3. After becoming a household name with roles in Passions, Smallville, The Young and the Restless and This Is Us, Hartley scored a major career success with Tracker. The show, which premiered in February 2024, was coined the most-watched broadcast premiere since NCIS' final episode with Mark Harmon in September 2021. Its average viewership was reported to be 18.2 million per episode.