Searxng/Tracker CBS TV show tv Celebrity Tracker elevates Chris Lee to series regular for Season 4. Join Justin Hartley as TV's top-rated survivalist hunts for the missing. April 13, 2026 AceShowbiz - Justin Hartley's hit CBS series Tracker is undergoing a significant casting update as it heads into its fourth season. The survivalist procedural has become a mainstay in network television, maintaining its status as the most-watched show during the 2025-2026 TV season.