‘Tracker’s’ “The Best Ones”: The Cast That Made CBS’s Biggest Hit a Sunday Night Obsession

Few shows in recent memory have pulled off what ‘Tracker’ has managed to do on CBS. In an era of fractured attention spans and streaming-first habits, this survivalist procedural has built one of the most loyal weekly audiences on all of broadcast television, and the people in front of the camera deserve a significant share of the credit.

The timing of the Season 3 finale, titled “The Best Ones,” feels almost too fitting. The episode aired Sunday, May 24, on CBS and streams on Paramount+, concluding a season that pushed its hero deeper into a conspiracy surrounding a nefarious government research project. As the chapter closes, it is worth looking at the performers who made it all work.

Justin Hartley Is the Engine the Whole Show Runs On

There is a reason ‘Tracker’ lives or dies with its lead. Justin Hartley anchors the CBS original drama as Colter Shaw, a lone survivalist and skilled tracker with a knack for finding missing people, and he also pulls double duty as an executive producer on the series. That level of investment shows in every frame.

Hartley’s performance in the Season 3 premiere showed Colter as more directionless than audiences had ever seen him, grappling with a devastating family revelation while still finding a way back to the work he does best. The balance of emotional complexity and action-driven momentum is no small feat for a weekly procedural.

The Season 3 premiere of ‘Tracker’ drew 17.3 million viewers, a figure that was up six percent compared to the prior year’s premiere. Those numbers are a direct referendum on how much audiences trust Hartley to deliver. Through the 2025 calendar year, ‘Tracker’ was virtually tied with ABC’s ‘High Potential’ as the most-watched entertainment series on broadcast television, with both shows averaging around 16.5 million viewers across multiplatform data.

Fiona Rene Brings the Heart That Colter Cannot Always Show

If Hartley is the show’s spine, Fiona Rene is its emotional core. Rene plays Reenie Greene, an attorney and Colter Shaw’s friend and love interest, whose smarts, wit, and drive give the show’s main characters something extra, and her chemistry with Hartley makes the story stronger while giving the darker parts of the narrative a warmer feel.

By Season 3, Reenie’s role expanded significantly, with Colter’s team now leaning on her to recommend his unique services to well-off clients of her Denver-based law practice, effectively making her a central hub of the entire operation. That structural shift elevated her from supporting player to genuine co-lead, and Rene handles the additional weight with ease.

Rene is the only other original main cast member returning alongside Hartley, a fact that underscores just how central she has become to the show’s identity. Fans have consistently responded to her warmth and intelligence onscreen, and the audience numbers reflect that the Colter-Reenie dynamic is one of the primary reasons viewers keep coming back week after week.

Jensen Ackles and the Russell Shaw Effect

Perhaps no casting decision in ‘Tracker’ history has paid off quite as richly as bringing Jensen Ackles into the fold. Ackles plays Russell Shaw, Colter’s brother, and returned as a special guest star in Season 3, appearing in the first two episodes before making his highly anticipated return for the concluding stretch of the season.

The creative decision to bring Ackles back for not just one but multiple appearances gave Season 3 an additional emotional and narrative anchor, with the two brothers’ fractured relationship providing some of the most compelling character work the show has produced.

Over the course of his appearances in the first two seasons, Russell and Colter worked on repairing their relationship, a dynamic that deepened considerably once Colter learned that Russell had not killed their father.

The Season 3 finale brought Ackles back alongside Hartley and Laurel Marsden as Lola, with teaser photos revealing that Russell does not come out of the final confrontation unscathed. Fan reaction to his returns has consistently been some of the loudest of any episode the show has produced, and online buzz around a potential Russell Shaw spinoff has only grown louder with each appearance.

Chris Lee’s Randy and the Art of Filling Big Shoes

When ‘Tracker’ lost several key ensemble members ahead of its third season, the show needed someone to hold the technical and comedic support role together. Chris Lee returned as Randy, effectively taking over the tech and information support duties previously handled by Bobby, and Season 3 suggests that the leaner ensemble dynamic is so much more, with Colter proving just as effective without splitting his resources as many ways.

Lee had been a prominent member of Colter’s team since Season 2, establishing a stronger connection with Reenie by moving directly into her firm’s office and working alongside her, which gave his character an organic integration into the show’s tighter new structure. CBS made Lee’s promotion to series regular official, and the announcement almost guarantees his return when ‘Tracker’ comes back in Season 4.

Season 3 also introduced Kathleen Robertson as Maxine, a successful attorney at a major firm, and Mark Engelhardt in a recurring role, further expanding the world around Colter without overcrowding it. The writers have shown a consistent instinct for knowing which characters earn their screen time and which ones get the axe.

What Season 4 Means for the Cast Going Forward

The momentum behind ‘Tracker’ heading into its next chapter is undeniable. The show secured 16.4 million viewers in 28 days for its midseason return, a number that would be the envy of virtually any drama on television right now. Season 4 will also mark the first time the show moves production from Canada to Los Angeles, a significant shift that signals the network’s long-term confidence in its flagship drama.

Hartley himself told Deadline that the show has introduced so many wonderful characters that he would love to bring back, and that he thinks they will be able to do so in Season 4. For a show built around a lone wolf, ‘Tracker’ has quietly assembled one of the most quietly beloved ensembles in network television, and the Season 3 finale title “The Best Ones” lands with a double meaning that feels entirely intentional.

With Russell Shaw’s fate hanging by a thread at the end of the season and Season 4 promising a brand new production home, now is the perfect time to share which member of the ‘Tracker’ cast you think has been the most essential to the show’s run, and whether you think Jensen Ackles deserves his own spinoff before Colter Shaw’s story is done.