The CBS hit series Tracker has been given an electrifying shakeup, and fans of the show will be the real beneficiaries. Veteran television stars, Kathleen Robertson and Mark Engelhardt, have been nabbed as series regulars for season six, adding new layers to the captivating story arc that revolves around Justin Hartley’s iconic character, Colter Shaw.
Who’s Coming to Tracker?
Kathleen Robertson, who is likely best remembered for the searing Swimming with Sharks, has been cast as Maxine, a powerhouse attorney at a top firm. An interesting premise is introduced with her character: she befriends Reenie Greene (Fiona Rene, who is simply wonderful) and appears to be engaged in routine legal work on a class action suit. But here is the surprise nothing is what it was supposed to be up close.

Maxine is hiding something big and it will rock the boat. Robertson also has a producing and writing background, the kind of creative smarts that is sure to add additional layers to her role.
Mark Engelhardt (best known for American Horror Story: Asylum) will now play Emile Sark, a man with a strong sense of right and wrong. Paul’s description makes him sound cold, calculating and ruthless — a man who lives by his own rules, morals and ethics. A character like this could really shake up the dynamic of the show and cause some amazing tension.
What This Means for Tracker
These two casting additions are interesting in the development of the series. Tracker has been a powerhouse for CBS since debuting after Super Bowl LVIII in February 2024. Based on Jeff Deaver’s best-selling novel The Never Game, the drama centers on Colter Shaw, who roams the country, employing his unparalleled tracking and survival skills to find missing people and crack cases while raking in cash. Justin Hartley has nailed the role, he made me believe in the lone-wolf survivalist.

Season 3 had already been released on October 19, 2025, and the series continued to provide the quality storytelling that the viewers were expecting. Following the dramatic cliffhangers and family revelations of prior seasons, Colter is confronted with hard truths about his family’s past. With the addition of Robertson and Engelhardt’s characters to the mix, more depth and complexity is brought into the story.
The Show’s Evolution

What makes this casting development even more interesting is how it plays into a larger overhaul of the series’ supporting players. It was previously announced that series regulars Eric Graise (who played tech-savvy hacker Bobby) and Abby McEnany (who was the empathetic Velma) exited the show. This allowed the show’s creators to take the series in new directions, and introduce completely new character dynamics.

Elwood Reid (showrunner) has been very clear about what he wants the series to be: for every week, starting with Colter coming into a new place with a new case and how he goes about approaching solving it is entirely for grabs. This loose format allowed the series to bring in several memorable guest stars and recurring characters who added a unique element to the storyline.
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Conclusion
Robertson and Engelhardt round out a cast including the powerhouse Justin Hartley and the incredible Fiona Rene. The series has already shown that it can lure big-name guest stars such as Jensen Ackles, Sofia Pernas and a host of other fan favorites.
With these two talented additions, Tracker is set to keep the wins coming. The arrival of Maxine and Emile Sark promises some interesting story lines, especially as these characters relate to Reenie and to Colter’s investigations. Whether they wind up allies or enemies, one thing is for certain: the CBS series is still pushing the envelope in exhilarating ways that keep viewers hooked and starving for more.
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