Colter Shaw helps one of Renee’s friends find her missing son in Tracker Episode 4.

1923andScreamstar Marley Shelton appears as a guest star inTrackerEpisode 4.

TrackerEpisode 4 premiered on CBS on March 3.

Eric Graise as Bob Exley, Justin Hartley as Colter Shaw, Cassandra Sawtell as Lisa Jefferson

Desperate to find the teenage boy alive, Colter goes all-out on his investigation.

Hartley is best known for his roles inSmallvilleandRevenge.

The actor also appeared as Kevin Pearson inThis Is Us.

Justin Hartley as Colter Shaw

In Episode 4, Colter calls Teddi and Velma to obtain the 4-1-1 on the Shelter Stone Academy.

Weigert has credits inThe Sessions,The Good German, andAmerican Horror Story.

McEnany previously appeared inWork in Progress,Roomies, andBrown Girl Problems.

Robin Weigert as Teddi Bruin in Tracker Episode 4

He is also a proud owner of his security company.

Fans may recognize Graise for his roles inThe Tomorrow War,Queer as Folk,andLocke & Key.

Fiona Rene - Reenie

Fiona Rene brings Reenie to life inTrackerEpisode 4.

Abby McEnany as Velma in Tracker Episode 4

The budding romance between Reenie and Colter is also pushed to the forefront in Episode 4.

I Know What You Did Last Summerfans may recognize Rene for her role as Lyla in the series.

The actress also appeared inThe Lincoln Lawyer,Fire Country, andStumptown.

Eric Graise as Bobby Exley in Tracker Episode 4

The character is played by Marley Shelton.

Shelton previously appeared as Emma Dutton in1923.

The actress also has credits inScream,Tomorrow’s Monsters, andRise.

Fiona Rene as Reenie

Dillon’s most recognizable role is playing Tyler Flaherty inHolly Hobbie.

The actor’s other notable credits includeThe Exorcist,Deadpool 2, andFamily Law.

In Episode 4, Lisa is Noah’s girlfriend who was badly injured by her ex-boyfriend.

Marley Shelton as Erika in Tracker Episode 4

Chris William Martin - Tom Ritter

Chris William Martin joins the cast ofTrackeras Tom Ritter.

Martin has credits inChaos Theory,The Vampire Diaries, andI Didn’t Kill My Sister.

In an attempt to find Noah, Mr. Gilroy uses his 12-member security team for his own search party.

Hunter Dillon as Noah in Tracker Episode 4

Later in the episode, Gilroy actively helps Colter during his investigation.

The actor also appeared inFamily LawandThe Irrational.

Darius Willis - Johnny

Darius Willis is another guest star in Episode 4.

Cassandra Sawtell as Lisa Jefferson

He plays Johnny, a fellow student who last saw Noah before he disappeared.

Willis is known for his roles inThe Chilling Adventures of Sabrina,Prom Pact, andLittle Fish.

Ray is Lisa’s ex-boyfriend and a dealer who supplies dangerous drugs to students living inside Shelter Stone Academy.

Chris William Martin as Tom Ritter in Tracker Episode 4

Noah confronted Ray to tell him to leave Lisa alone, and this encounter led to his sudden disappearance.

Arner is a stunt performer known for his work onPower Rangers,The Predator,andStar Trek Beyond.

Collins previously appeared inMonarch: Legacy of Monsters,Joe Pickett, andSupernatural.

Peter Bryant as Mr. Gilroy

New episodes ofTrackerpremiere every Sunday at 9 p.m.

ET on CBS and stream the next day onParamount+.

Read more about other CBS shows:

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Darius Willis as Johnny in Tracker Episode 4

Tyson Arner as Ray Vernon in Tracker Episode 4

Josh Collins as Alex Cooper in Tracker Episode 4

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