Tracker Season 4 Episode 3 photos preview “Original Parts,” airing Sunday, October 18, from 9:30–10:30 p.m. ET/PT on CBS. Justin Hartley stars as Colter Shaw alongside Fiona Rene, Chris Lee and Cassady McClincy Zhang as Colter takes on a missing-person case in Texas.
Michael Malarkey guest stars as Adam Shevlin, an old friend whose unexpected reunion with Reenie Greene brings her past back into focus. The episode pairs Colter’s latest search with a personal development for Reenie.
Tracker Season 4 Episode 3 Details
Episode
Season 4 Episode 3, “Original Parts”
Air Date
Sunday, October 18, 2026
Time
9:30–10:30 p.m. ET/PT
Network
CBS
Streaming
Live with Paramount+ Premium; next-day streaming Monday, October 19, on Paramount+
Guest Star
Michael Malarkey as Adam Shevlin
Written By
Elwood Reid
Directed By
Ken Olin
What Is “Original Parts” About?
Colter is hired to find a woman who vanished after an argument with her husband in a deserted Texas town. The circumstances give him a starting point for the search, but the official preview does not reveal what happened to her after the argument.
The case takes Colter into an isolated setting as he works to locate the missing woman. Her husband’s involvement in the disagreement is part of the setup; the synopsis does not establish that he is responsible for her disappearance.
“Original Parts” was written by Elwood Reid and directed by Ken Olin.
Michael Malarkey Appears as Adam Shevlin
Away from Colter’s assignment, Reenie encounters an old friend: Adam Shevlin, played by Michael Malarkey. The reunion is unexpected and leaves her revisiting her past.
Fiona Rene’s Reenie has a personal thread alongside the episode’s search. CBS keeps the details of her history with Adam out of the synopsis, leaving their connection and the consequences of his arrival to unfold on screen.
Who Stars in Tracker?
Justin Hartley leads the series as survivalist and tracker Colter Shaw. Fiona Rene plays attorney Reenie Greene, Chris Lee plays tech expert Randy, and Cassady McClincy Zhang plays Melanie “Mel” Day, Reenie’s assistant. Michael Malarkey joins this episode as Adam Shevlin.
Tracker Season 4 Episode 3 Photos — “Original Parts”
Tracker Season 4 Episode 3, “Original Parts,” airs Sunday, October 18, from 9:30–10:30 p.m. ET/PT on CBS. Watch live with Paramount+ Premium, or stream the episode the next day, Monday, October 19, with any Paramount+ plan. Catch up through the official Tracker streaming page.
More Tracker Coverage
Visit our Tracker coverage hub for more episode photos, previews, recaps and casting news.
Thomas Miller is the founder and Editor-in-Chief of Seat42F, covering television, movies and streaming entertainment. He launched Seat42F in 2007 and has spent nearly two decades covering the entertainment industry.
